Moiré on A7III + Batis 18mm

enigma_jq · Jul 18, 2018

Hi, I got a Batis 18/2.8 and tested out a few shots. What I noticed was moiré on the buildings I shot. I used to shoot with 5Dii and 7Dii with Canon lens that are not particularly sharp, so I don't know if this level of moiré is normal given the resolution of A7III + Batis 18mm (even though A7III does have AA filter).

Note the moiré on the building windows behind the train station. Thanks for the input.

JimKasson · Jul 18, 2018

enigma_jq said:
Hi, I got a Batis 18/2.8 and tested out a few shots. What I noticed was moiré on the buildings I shot. I used to shoot with 5Dii and 7Dii with Canon lens that are not particularly sharp, so I don't know if this level of moiré is normal given the resolution of A7III + Batis 18mm (even though A7III does have AA filter).

Note the moiré on the building windows behind the train station. Thanks for the input.

Sharp lens + 12 or 24 MP Bayer sensor (AA or not) + right (or wrong) subject = moire. This looks pretty easy to fix. 42 MP is not enough to get rid of the effect.

Jim

--

the last word the last word - Photography meets digital computer technology. Photography wins -- most of the time.

Photography meets digital computer technology. Photography wins -- most of the time.

blog.kasson.com

BBQue · Jul 18, 2018

A7iii has an AA filter, but I believe it is a very weak one.

Shoot raw and you can fix it in post. Recommend Capture One.

PS: Kodak still has stores? Or is that a left-over sign?

Roland Schulz · Jul 18, 2018

I hardly see a real problem here.
a7M3 has a quite weak AA filter that is a good thing in my eyes. Depends on the subjects you are shooting, but until now the less agressive AA filter was more pro than con for me.
If this is a problem for you you can easily fix this in Lightroom for example (brush tool/moiré).

enigma_jq · Jul 18, 2018

Thanks. Yes, easy to fix in post. Just wanna make sure this is not faulty sensor or lens as I did not notice much moiré with Canon.

enigma_jq · Jul 18, 2018

BBQue said:
A7iii has an AA filter, but I believe it is a very weak one.

Shoot raw and you can fix it in post. Recommend Capture One.

PS: Kodak still has stores? Or is that a left-over sign?

Just a sign. It's Central Camera in Chicago. I've been taking random shots in the city lol.

Erik Kaffehr · Jul 18, 2018

Hi,

Moiré means good lens, properly focused. OLP filters are not strong enough to suppress color moiré fully.

It is say that A7 series has a single layer of OLP filter instead of the normal double layer.

Jim is correct that 42 MP on the A7rII is not enough to eliminate color moiré, as I have seen it on some images.

Just keep in mind, that even simple resizing of an image will cause aliasing artefacts, like moiré, but aliasing on a demosaiced image will yield a monochrome (luminousity modulated) moiré effect.

Best regards

Erik

enigma_jq said:
Thanks. Yes, easy to fix in post. Just wanna make sure this is not faulty sensor or lens as I did not notice much moiré with Canon.

BBQue · Jul 19, 2018

enigma_jq said:
BBQue said:

A7iii has an AA filter, but I believe it is a very weak one.

Shoot raw and you can fix it in post. Recommend Capture One.

PS: Kodak still has stores? Or is that a left-over sign?

Click to expand...

Just a sign. It's Central Camera in Chicago. I've been taking random shots in the city lol.

Pretty good for random shot

Back to your question, everything is fine. A7iii has a weak AA filter (which generally means sharper images, but more likelihood of moiré. My A7riii has no AA filter (even sharper, but even more likelihood of moiré). Presence of moiré also shows what an incredibly sharp lens the Batis is!

Easy to fix for stills. The bigger problem would be video.

Scott A Edwards · Sep 12, 2019

I shoot with Sony A7R2s... I'm increasingly running into moire issues on certain fabrics... only when certain fabrics (which can range from basic cotton shirts, say a blue cotton shirt where the fabric pattern is clearly seen and in focus... to more complex fabrics). It is beginning to drive me nuts... I have several times now had to go back and dumb sharpness all the way down (I use Capture One) and even in certain RAW files I can see slight moire issues prior to processing. My moire issues have been almost exclusively with the new Sony 135 GM 1.8. Even the moire function in Capture One seems inadequate in many instances. What to do?!!

DenImage · Sep 12, 2019

Scott A Edwards said:
I shoot with Sony A7R2s... I'm increasingly running into moire issues on certain fabrics... only when certain fabrics (which can range from basic cotton shirts, say a blue cotton shirt where the fabric pattern is clearly seen and in focus... to more complex fabrics). It is beginning to drive me nuts... I have several times now had to go back and dumb sharpness all the way down (I use Capture One) and even in certain RAW files I can see slight moire issues prior to processing. My moire issues have been almost exclusively with the new Sony 135 GM 1.8. Even the moire function in Capture One seems inadequate in many instances. What to do?!!

Paint the moiré out using the Lightroom brush tool:

Its the quickest most effective method I've used.

Or for batch moiré removal, select all the moiré images in DXO PhotoLab then set the moiré removal slider to 50%, job done.

Den

Erik Kaffehr · Sep 13, 2019

Hi,

Lightroom has a tool called enhance detail or something like it, it uses AI to identify and elimate color moire. It needs a decent GPU, that is graphics card, to run at speed.

Best regards

Erik

Scott A Edwards · Oct 21, 2019

Thanks, Den. He makes it look too easy... I've been trying this in Capture One 12 and it just ain't cutting it. I've also found that with the 135 GM 1.8, I need to not sharpen images as I have often done in the past. Anyway, I guess I need to get back into Lightroom for such moments. Thanks again.

JimKasson · Oct 21, 2019

Scott A Edwards said:
Thanks, Den. He makes it look too easy... I've been trying this in Capture One 12 and it just ain't cutting it. I've also found that with the 135 GM 1.8, I need to not sharpen images as I have often done in the past. Anyway, I guess I need to get back into Lightroom for such moments. Thanks again.

You can eliminate false color and moire by stopping down the lens. Here's an f-stop sequence with a camera whose pitch is the same as the a7RIV.

https://blog.kasson.com/gfx-100/a-visual-look-at-gfx-100-diffraction-blur/

You'd have to stop down slightly further with a sensor with a coarser pitch.

You can then use deconvolution blur to restore some of the lost sharpness.

Jim

--
https://blog.kasson.com

Dave_Good · Oct 21, 2019

Scott A Edwards said:
I shoot with Sony A7R2s... I'm increasingly running into moire issues on certain fabrics... only when certain fabrics (which can range from basic cotton shirts, say a blue cotton shirt where the fabric pattern is clearly seen and in focus... to more complex fabrics). It is beginning to drive me nuts... I have several times now had to go back and dumb sharpness all the way down (I use Capture One) and even in certain RAW files I can see slight moire issues prior to processing. My moire issues have been almost exclusively with the new Sony 135 GM 1.8. Even the moire function in Capture One seems inadequate in many instances. What to do?!!

While in C1 you could add a layer with the affected area selected and run the moire removal tool again.

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Moiré on A7III + Batis 18mm

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