Direct Lens Comparison: GR III vs GR IV

and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
The GRIV's image stabilization system is more aggressive than the GRIII's weaker image stabilization system. Stronger vibrations from the GRIV occurred when mounted to the tripod causing greater motion blur to the image compared to the GRIII.
Seems plausible for sure. But if you look at the second pair of images it’s not consistent (4 looks sharper than the 3). Which may be coincidence if a burst was shot and best results were cherry picked).
I'm not looking at these images again.
I’m not sure I’d characterize someone’s best effort and initial hypothesis as “misinformation” when these are all just guesses right now.
It wasn’t a hypothesis. It was a flawed test. I regret going down this rabbit hole.
This set of test photos isn’t concerning to me, I’m still looking forward to my GRIV later this month (fingers crossed).
Enjoy your new camera.
I will. I’ll enjoy it free of anger about other people posting sample images :)
You mistake anger, for my disbelief of individuals continuing to 'prop up' a flawed test.
 
I have many MFT cameras with IBIS and no material difference if IBIS is on or off when placed on a tripod. Maybe this is a particular shortcoming of Ricoh cameras then?
I think I noticed it with my older E-M1 mkII Olympus (before parting with it) but I don’t see it with my Nikon Z8 or Fuji. But then again I haven’t experimented with it enough to know if it’s consistent or not.
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
The GRIV's image stabilization system is more aggressive than the GRIII's weaker image stabilization system. Stronger vibrations from the GRIV occurred when mounted to the tripod causing greater motion blur to the image compared to the GRIII.
Seems plausible for sure. But if you look at the second pair of images it’s not consistent (4 looks sharper than the 3). Which may be coincidence if a burst was shot and best results were cherry picked).
I'm not looking at these images again.
I’m not sure I’d characterize someone’s best effort and initial hypothesis as “misinformation” when these are all just guesses right now.
It wasn’t a hypothesis. It was a flawed test. I regret going down this rabbit hole.
This set of test photos isn’t concerning to me, I’m still looking forward to my GRIV later this month (fingers crossed).
Enjoy your new camera.
I will. I’ll enjoy it free of anger about other people posting sample images :)
You mistake anger, for my disbelief of individuals continuing to 'prop up' a flawed test.
I never propped an anything. In fact I’m more likely to believe, as I said, the GRIV lens is fine and that your suggestion about the tripod/IBIS is plausible (or even likely). I mean it’s a forum for discussion, right?
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
He posted another set later with sharper files from the IV. If you're leaving IBIS/SR enabled on a camera that doesn't automatically disable it while shooting on a tripod your test isn't going to show anything useful. It simply misinforms people about the comparative performance of each lens, which is worse than not doing the test at all.
Yet the test results are the test results and can be interpreted by people and not every explanation is going to be correct. Are you saying you’re never wrong? Or do you mean only studio experts can post results? This is a forum after all and I appreciated the post.
The lens on my IV appears sharper than the III, especially in the corners, and the DPReview test chart comparison supports that.
I see. So you feel there’s zero value in discussion.
This is twilight zone stuff. Ridiculous.

The test was flawed. It was billed as a "direct lens comparison" but did not tell us anything about comparative lens performance. If the OP had not volunteered the information about IBIS/SR, people would have the misconception that the IV lens is softer than the III. Hence it's important to challenge the test methodology. There is zero value in a discussion around a flawed test, except that perhaps some people now understand that SR should be disabled on GR cameras mounted on (stable) tripods. Testing lenses and sensors is difficult and I hold nothing against the OP for trying, but we should be very careful when making determinations about performance.
 
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My main point isn’t to compare which camera is better, but to note that the GR4’s lens improvement is only marginal relative to the price jump.
Unfortunately you didn’t prove anything, because your testing methodology was flawed.
I don't think the methodology was flawed at all. For those that will leave IBIS on (i.e. many of us), the test is very relevant. With IBIS on, the GRIII has a sharper image.
So you are saying that you will continue to use IBIS knowing when a cam is mounted on a tripod it will cause image blur. Why even bother with a tripod?

If you don’t believe me… then google it. There are thousands of discussions from amateur and professional photographers alike explaining the benefits of disabling Image stabilization when mounted to a tripod.
The tripod was used as a reference point to help align the images.
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
He posted another set later with sharper files from the IV. If you're leaving IBIS/SR enabled on a camera that doesn't automatically disable it while shooting on a tripod your test isn't going to show anything useful. It simply misinforms people about the comparative performance of each lens, which is worse than not doing the test at all.

The lens on my IV appears sharper than the III, especially in the corners, and the DPReview test chart comparison supports that.
Then please show us your samples. To me, both the GR IV and GR III are junk — and with the price hike, the GR IV is even worse.
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
He posted another set later with sharper files from the IV. If you're leaving IBIS/SR enabled on a camera that doesn't automatically disable it while shooting on a tripod your test isn't going to show anything useful. It simply misinforms people about the comparative performance of each lens, which is worse than not doing the test at all.
Yet the test results are the test results and can be interpreted by people and not every explanation is going to be correct. Are you saying you’re never wrong? Or do you mean only studio experts can post results? This is a forum after all and I appreciated the post.
The lens on my IV appears sharper than the III, especially in the corners, and the DPReview test chart comparison supports that.
I see. So you feel there’s zero value in discussion.
This is twilight zone stuff. Ridiculous.

The test was flawed. It was billed as a "direct lens comparison" but did not tell us anything about comparative lens performance. If the OP had not volunteered the information about IBIS/SR, people would have the misconception that the IV lens is softer than the III. Hence it's important to challenge the test methodology. There is zero value in a discussion around a flawed test, except that perhaps some people now understand that SR should be disabled on GR cameras mounted on (stable) tripods. Testing lenses and sensors is difficult and I hold nothing against the OP for trying, but we should be very careful when making determinations about performance.
It just seemed pretty harsh to me that someone posts images, presents their hypothesis, and they're accused of spreading misinformation. I sounds like you disagree with that, and that's fine. I stand by my statements, though. I felt it was a helpful discussion.
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
He posted another set later with sharper files from the IV. If you're leaving IBIS/SR enabled on a camera that doesn't automatically disable it while shooting on a tripod your test isn't going to show anything useful. It simply misinforms people about the comparative performance of each lens, which is worse than not doing the test at all.

The lens on my IV appears sharper than the III, especially in the corners, and the DPReview test chart comparison supports that.
Then please show us your samples. To me, both the GR IV and GR III are junk — and with the price hike, the GR IV is even worse.
Yet you own both?

I don't need to make samples, the DPReview test chart reflects what I'm seeing from my copy. Your own tests contradict each other, but at least you're now aware how IBIS works on the GR cameras.

I replaced my GR III because I'm fed up with dust getting inside the body, and keeping the adapter and filter permanently affixed makes the camera form factor much larger and less convenient. I was also never happy with the excessive vignetting they introduced with the GR III lens (redesigned for close focusing). My GR IV has a faulty dial and is being returned to Ricoh. I believe these cameras are somewhat flawed so let's not assume I'm some kind of brand ambassador. I just think if you're going to make a statement about how a lens performs it'd be good if your comparison is actually useful.
 
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and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
He posted another set later with sharper files from the IV. If you're leaving IBIS/SR enabled on a camera that doesn't automatically disable it while shooting on a tripod your test isn't going to show anything useful. It simply misinforms people about the comparative performance of each lens, which is worse than not doing the test at all.

The lens on my IV appears sharper than the III, especially in the corners, and the DPReview test chart comparison supports that.
Then please show us your samples. To me, both the GR IV and GR III are junk — and with the price hike, the GR IV is even worse.
You're really too funny, you know! And now have pretty much no credibility!

Ricoh wins a "2025 Good Design Award" presented by the Japan Institute for Design Promotion which was founded in 1969.

"With a legacy spanning 30 years, the Ricoh GR IV blends pro-grade performance, minimalist design, and now award-winning recognition – a compact camera classic redefined in 2025"

"Part of the camera's appeal lies in its consistent design philosophy. As noted by the Good Design Award jury, the GR IV embodies a sense of continuity, retaining the defining visual and tactile characteristics of earlier models, while showing evidence of precise, user-informed refinement."

https://www.digitalcameraworld.com/...sign-award-for-its-redefined-minimalist-style

If you think the GRIII is junk why in the world did you buy a GRIV?
 
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and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
He posted another set later with sharper files from the IV. If you're leaving IBIS/SR enabled on a camera that doesn't automatically disable it while shooting on a tripod your test isn't going to show anything useful. It simply misinforms people about the comparative performance of each lens, which is worse than not doing the test at all.

The lens on my IV appears sharper than the III, especially in the corners, and the DPReview test chart comparison supports that.
Then please show us your samples. To me, both the GR IV and GR III are junk — and with the price hike, the GR IV is even worse.
Yet you own both?

I don't need to make samples, the DPReview test chart reflects what I'm seeing from my copy. Your own tests contradict each other, but at least you're now aware how IBIS works on the GR cameras.

I replaced my GR III because I'm fed up with dust getting inside the body, and keeping the adapter and filter permanently affixed makes the camera form factor much larger and less convenient. I was also never happy with the excessive vignetting they introduced with the GR III lens (redesigned for close focusing). My GR IV has a faulty dial and is being returned to Ricoh. I believe these cameras are somewhat flawed so let's not assume I'm some kind of brand ambassador. I just think if you're going to make a statement about how a lens performs it'd be good if your comparison is actually useful.
I keep the JJC lens cap on my GRIII and GRIIIx and have never had a dust problem going on four years.

https://www.amazon.com/Aluminium-An...4&sprefix=GRIIIX+lens+cap,aps,248&sr=8-3&th=1

I also routinely check all of my cameras when I'm out and when I come home and when out have one of those small lens brushes you get with the "care kits". And no matter what anyone can just get the short straw.

I think for the GRIV we have to wait and see if they come out with a cap.

Was the faulty dial on your GRIV the "Mode Dial'? Explain a bit more. Was it just the feel or something else?

Do you have photos that show the excessive vignetting? I haven't seen that in my photos and don't recall that as a complaint.
 
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and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
He posted another set later with sharper files from the IV. If you're leaving IBIS/SR enabled on a camera that doesn't automatically disable it while shooting on a tripod your test isn't going to show anything useful. It simply misinforms people about the comparative performance of each lens, which is worse than not doing the test at all.

The lens on my IV appears sharper than the III, especially in the corners, and the DPReview test chart comparison supports that.
Then please show us your samples. To me, both the GR IV and GR III are junk — and with the price hike, the GR IV is even worse.
Yet you own both?

I don't need to make samples, the DPReview test chart reflects what I'm seeing from my copy. Your own tests contradict each other, but at least you're now aware how IBIS works on the GR cameras.

I replaced my GR III because I'm fed up with dust getting inside the body, and keeping the adapter and filter permanently affixed makes the camera form factor much larger and less convenient. I was also never happy with the excessive vignetting they introduced with the GR III lens (redesigned for close focusing). My GR IV has a faulty dial and is being returned to Ricoh. I believe these cameras are somewhat flawed so let's not assume I'm some kind of brand ambassador. I just think if you're going to make a statement about how a lens performs it'd be good if your comparison is actually useful.
I keep the JJC lens cap on my GRIII and GRIIIx and have never had a dust problem going on four years.

https://www.amazon.com/Aluminium-An...4&sprefix=GRIIIX+lens+cap,aps,248&sr=8-3&th=1

I also routinely check all of my cameras when I'm out and when I come home and when out have one of those small lens brushes you get with the "care kits". And no matter what anyone can just get the short straw.

I think for the GRIV we have to wait and see if they come out with a cap.
I'm sorry but I'm not going over this again, it comes up time and again for a reason. The only viable solution in my opinion is the filter adapter permanently attached, but that transform the camera into something different and less convenient.
Was the faulty dial on your GRIV the "Mode Dial'? Explain a bit more. Was it just the feel or something else?
The front e-dial must have some kind of issue with the electronic connection as it skips options and settings can change even if I don't move it, just from a light touch of the dial without it physically turning. It also feels a little scratchy in some positions so perhaps a mechanical problem.
Do you have photos that show the excessive vignetting? I haven't seen that in my photos and don't recall that as a complaint.
 
I'm passing on the GR IV so can't comment on whether things have improved, but I had the dust issue with my GR II and III. Nothing since it was cleaned under warranty and I installed the filter. No issue with the IIIx but I installed the filter the day I bought it and never removed it.
 

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It's not at all what we are seeing in the dpr studio test scene, so I'd take this comparison as a non-representative test.

The dpr test shows the gr4 to have sharper centre and sharper corners.
From my perspective, the GR/GRII had the best lens. With each subsequent iteration, Ricoh has simplified the lens construction to save space and thus focus faster.

In the GRIII, a lens group in the front was combined into a single lens, resulting in some loss of sharpness and contrast. Above all, the GRIII has much more chromatic aberration (I never saw color fringing in my GRII, but I often see it in the GRIII).

With the GRIV, the design was made even more compact (for AF speed). To compensate for the optical weaknesses of the GRIII, an additional lens was added at the end (field flattener), similar to the lens construction of modern smartphone cameras. This allowed the presumably now missing microlenses on the sensor to increase the sharpness and shadowing of the outer corners of the image. In the test chart, I also think I can see that the GRIV is now fundamentally sharper than the GRIII, but not sharper than the GR/GRII.

However, it appears that a decision was made in favor of smaller lateral chromatic aberration but to the detriment of more longitudinal chromatic aberration. Noticeable color fringing can be seen in some images in the dpreview image gallery.

In addition, the new antistatic coating on the sensor seems to produce a kind of halation/diffusion filter effect, as Samuel explains on his YouTube channel.
this sounds like a comment from someone who knows optics (i do not and i appreciate your feedback) i wonder if the lower mp count (resolution) of gr-grii is affecting the sharper grii conclusion/illusion? how would the files look like if they were downsized to gr-grii resolution? i also noticed some difference in character of lens flare. it became more obvious when i played with the following file https://www.dpreview.com/forums/post/68477174?image=0 that was shared in this thread: https://www.dpreview.com/forums/post/68472657
 
My main point isn’t to compare which camera is better, but to note that the GR4’s lens improvement is only marginal relative to the price jump.
Unfortunately you didn’t prove anything, because your testing methodology was flawed.
I don't think the methodology was flawed at all. For those that will leave IBIS on (i.e. many of us), the test is very relevant. With IBIS on, the GRIII has a sharper image.
So you are saying that you will continue to use IBIS knowing when a cam is mounted on a tripod it will cause image blur. Why even bother with a tripod?

If you don’t believe me… then google it. There are thousands of discussions from amateur and professional photographers alike explaining the benefits of disabling Image stabilization when mounted to a tripod.
but hasn't he shot both cameras on tripod and both with ibis on? it sure would have been interesting to see the results from both with ibis off. but if both were shot with same settings, i would consider it a valid comparison- even if not best practice for ibis. probably sample variation or defect was a better explanation for this particular test, as there are plenty of sharp gr4 images out there.
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
The GRIV's image stabilization system is more aggressive than the GRIII's weaker image stabilization system. Stronger vibrations from the GRIV occurred when mounted to the tripod causing greater motion blur to the image compared to the GRIII.
ok this answers my question above...too many messages in this thread. thanks.
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
The GRIV's image stabilization system is more aggressive than the GRIII's weaker image stabilization system. Stronger vibrations from the GRIV occurred when mounted to the tripod causing greater motion blur to the image compared to the GRIII.
ok this answers my question above...too many messages in this thread. thanks.
You’re welcome.
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
The GRIV's image stabilization system is more aggressive than the GRIII's weaker image stabilization system. Stronger vibrations from the GRIV occurred when mounted to the tripod causing greater motion blur to the image compared to the GRIII.
Shooting on a tripod is done usually with a delay. In this case, shake reduction is automatically turned off.
ok this answers my question above...too many messages in this thread. thanks.
You’re welcome.
 

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and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
The GRIV's image stabilization system is more aggressive than the GRIII's weaker image stabilization system. Stronger vibrations from the GRIV occurred when mounted to the tripod causing greater motion blur to the image compared to the GRIII.
Shooting on a tripod is done usually with a delay. In this case, shake reduction is automatically turned off.
Thanks for mentioning this detail
ok this answers my question above...too many messages in this thread. thanks.
You’re welcome.
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
The GRIV's image stabilization system is more aggressive than the GRIII's weaker image stabilization system. Stronger vibrations from the GRIV occurred when mounted to the tripod causing greater motion blur to the image compared to the GRIII.
Shooting on a tripod is done usually with a delay. In this case, shake reduction is automatically turned off.
ok this answers my question above...too many messages in this thread. thanks.
You’re welcome.
Shooting with a timer does not automatically turn off shake reduction on my GRIIIx. I just checked. I set the timer to 10 seconds and checked shake reduction and it was "On" where I had left it.
 
and is worse than useless.
This is unnecessarily cruel and wrong.

I think the shots were useful as an average user would come to the conclusion that no material improvement in image sharpness in going from the III to the IV. There may actually be a slight downgrade. The IV has many other positive attributes but those were not the point of this thread.
Exactly - that conclusion is contrary to every other test I've seen, and my own experience. Hence it's worse than useless, as it's misinforming people. The IV's lens is sharper than that of the III.
Well the photos are the photos. Can you provide an alternate conclusion that explains them rather than the shooter mixed them up? I assume exif info can corroborate the claims or refute it.
He posted another set later with sharper files from the IV. If you're leaving IBIS/SR enabled on a camera that doesn't automatically disable it while shooting on a tripod your test isn't going to show anything useful. It simply misinforms people about the comparative performance of each lens, which is worse than not doing the test at all.

The lens on my IV appears sharper than the III, especially in the corners, and the DPReview test chart comparison supports that.
Then please show us your samples. To me, both the GR IV and GR III are junk — and with the price hike, the GR IV is even worse.
Yet you own both?

I don't need to make samples, the DPReview test chart reflects what I'm seeing from my copy. Your own tests contradict each other, but at least you're now aware how IBIS works on the GR cameras.

I replaced my GR III because I'm fed up with dust getting inside the body, and keeping the adapter and filter permanently affixed makes the camera form factor much larger and less convenient. I was also never happy with the excessive vignetting they introduced with the GR III lens (redesigned for close focusing). My GR IV has a faulty dial and is being returned to Ricoh. I believe these cameras are somewhat flawed so let's not assume I'm some kind of brand ambassador. I just think if you're going to make a statement about how a lens performs it'd be good if your comparison is actually useful.
I keep the JJC lens cap on my GRIII and GRIIIx and have never had a dust problem going on four years.

https://www.amazon.com/Aluminium-An...4&sprefix=GRIIIX+lens+cap,aps,248&sr=8-3&th=1

I also routinely check all of my cameras when I'm out and when I come home and when out have one of those small lens brushes you get with the "care kits". And no matter what anyone can just get the short straw.

I think for the GRIV we have to wait and see if they come out with a cap.
I'm sorry but I'm not going over this again, it comes up time and again for a reason. The only viable solution in my opinion is the filter adapter permanently attached, but that transform the camera into something different and less convenient.
Yes, I have NiSi adapters for both the GRIII and GRIIIx and put a UV filter and lens hood on it for situations when I might shoot in the rain or am on a beach.
Was the faulty dial on your GRIV the "Mode Dial'? Explain a bit more. Was it just the feel or something else?
The front e-dial must have some kind of issue with the electronic connection as it skips options and settings can change even if I don't move it, just from a light touch of the dial without it physically turning. It also feels a little scratchy in some positions so perhaps a mechanical problem.
Ok, sorry to hear that. It's frustrating to buy something new and start out with a problem. Hope your new GRIV arrives back soon!
Do you have photos that show the excessive vignetting? I haven't seen that in my photos and don't recall that as a complaint.
Mitchell Clark wrote:

"Speaking of the corners, you've likely noticed the heavy vignetting. While it's a touch better than the III, compared to cameras like the X100VI and the RX1R III, the GR IV's lens is noticeably darker in the periphery, even at F5.6. It doesn't get much worse when you open it up to F2.8, though, so the camera's built-in correction profile doesn't have to do a bunch of extra brightening for wide-open shots. It deals with the vignetting very nicely in JPEGs, though the corners getting less light means you'll see the extra noise there upon correction."

This perplexes me as it's something I haven't heard on this forum in the past. I didn't buy my GRIII until after my GRIIIx in 2021. So, I'm wondering if there were changes made to the lens. Purely speculation on my part. I would have no idea. I looked at a lot of different photos last night in different albums I have in all kinds of conditions.
 
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