Joesiv

Joesiv

Lives in Canada Cloverdale, BC, Canada, Canada
Works as a Software Quality
Has a website at www.joesiv.com
Joined on Aug 11, 2006

Comments

Total: 142, showing: 1 – 20
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On Sony Alpha 7S Review preview (390 comments in total)
In reply to:

Joesiv: I think the dynamic range test needs to have a similarily pulled back exposure test to be anything close to conclusive.

Over expose by 3 stops, and see what they look like. Perhaps the A7S would be better than the rest, thus meeting Sony's claims, or perhaps it wouldn't.

In the past Dpreview did the wedge test, and showed raw pulling and pushing, as the dynamic range representation. This test, would be if they only extended the shadow range, somewhat half baked.

Thanks guys, I wasn't aware that you were looking at the actual raw data while setting up the exposures, knowing how many absolute values are in 14bit, you would know how close you are to the "ETTR", and you're right middle grey becomes in-consequential.

Direct link | Posted on Mar 3, 2015 at 05:06 UTC
On Sony Alpha 7S Review preview (390 comments in total)
In reply to:

Joesiv: I think the dynamic range test needs to have a similarily pulled back exposure test to be anything close to conclusive.

Over expose by 3 stops, and see what they look like. Perhaps the A7S would be better than the rest, thus meeting Sony's claims, or perhaps it wouldn't.

In the past Dpreview did the wedge test, and showed raw pulling and pushing, as the dynamic range representation. This test, would be if they only extended the shadow range, somewhat half baked.

I don't really care so much about JPG's. But where that breaking point is, in RAW is what I'm interested in. And not only that, what it looks like. I found the shadow pushing to be quite interesting, comparing what it looks like between cameras (thanks). I figured it would also be interesting to see what the highlight retention looked like.

You say you exposed to the right, what did you base that exposure on? Hopefully not the on-camera histogram, because that is typically based off the internal JPG processing. Unless you take the RAW file into an editor, and pull back to see where the actual breaking point (highlight leeway), "exposing to the right" could potentially be limiting your dynamic range potential.

I find that my cameras typically will have another 1.5 stops of highlight potential, with full color retention, beyond what my in-camera histogram shows me (I can't wait to try out the D750's raw histogram, soon).

Perhaps, we would find nothing in the test, but maybe not.

Direct link | Posted on Mar 2, 2015 at 21:30 UTC
On Sony Alpha 7S Review preview (390 comments in total)

I think the dynamic range test needs to have a similarily pulled back exposure test to be anything close to conclusive.

Over expose by 3 stops, and see what they look like. Perhaps the A7S would be better than the rest, thus meeting Sony's claims, or perhaps it wouldn't.

In the past Dpreview did the wedge test, and showed raw pulling and pushing, as the dynamic range representation. This test, would be if they only extended the shadow range, somewhat half baked.

Direct link | Posted on Mar 2, 2015 at 20:37 UTC as 68th comment | 9 replies
On Olympus OM-D E-M5 II First Impressions Review preview (1328 comments in total)
In reply to:

Roman Korcek: It is really a pity that Olympus did not implement image stabilization with the 40 MPx mode. It should be quite easy from an algorithmic point of view.

Roman, sure it's still a 16MP sensor, but because of the shifting of half pixels to add detail, you still need to have sub (16MP) pixel detail. And, I think it's s a stretch to say that you get 16MP worth of details reliability at 1 second shutter, let alone 40MP.

Direct link | Posted on Feb 5, 2015 at 18:34 UTC
On Olympus OM-D E-M5 II First Impressions Review preview (1328 comments in total)
In reply to:

mpgxsvcd: The high resolution mode appears to eliminate most moire, aliasing, and noise. It is too bad that they don't allow it to go above ISO 1600. This could be an outstanding feature for Astro Photography if the shutter duration was longer and the ISO could go higher.

If I understand it correctly, the shutter speed you pick, is used for each of the 8 shots, so really, your shutter speed is 8x's as long as selected (likely more since there will be minor gaps between exposures). How long would you want to go? I'm just seeing if we're in the ballpark.

I take it you'd have a tracking rig (whatever they're called), as you'll get some funky start trails otherwise.

Direct link | Posted on Feb 5, 2015 at 17:10 UTC
On Olympus OM-D E-M5 II First Impressions Review preview (1328 comments in total)
In reply to:

ThePhilips: Thinking about the suggested 4 shot mode.

I wonder what once can accomplish with 2 shot mode. In the RG/GB layout, shift by one horizontally or vertically would mean combining pixels on the same lane: R+G (yellow) and G+B (cyan). Shift by one diagonally: R+B (purple) and G+G. In other words, in addition to the original color of the pixel, bit of another color gets mixed in.

Another idea is to shift by two pixels to double the information in the (inherently noisy) blue channel.

Or no shifting, and just merging a short electronic exposure and long (the set exposure time), and merge for HDR, or just better highlight retention.

Direct link | Posted on Feb 5, 2015 at 17:08 UTC
On Olympus OM-D E-M5 II First Impressions Review preview (1328 comments in total)
In reply to:

PicOne: "Hi Res mode is limited to a maximum of ISO 1600 and a minimum aperture of F8 because beyond these points, the image becoming too blurred for the extra resolution to be particularly beneficial."

Huh? Is this a reference to diffraction and noise effects? If there's a reason for shooting in regular 16mp mode at over 1600 ISO or eg. f11, then not seeing why this reason goes away in hi res mode? For noise.. how would a 40mp downsampled shot (back to 16mp) compare?

If you're really concerned about noise, you should just drop the ISO and use a REALLY long shutter, similar to the time of the multi-shot, you'll actually get better results since motion will be blurred naturally.

Direct link | Posted on Feb 5, 2015 at 17:06 UTC
On Olympus OM-D E-M5 II First Impressions Review preview (1328 comments in total)
In reply to:

Roman Korcek: It is really a pity that Olympus did not implement image stabilization with the 40 MPx mode. It should be quite easy from an algorithmic point of view.

Sure they "could", but realize that image stabalization isn't a tripod, there is still potential for shifting. And with 40MP, every shift would be scrutinized (you'd have much more than 1 pixel shifts if not on a tripod), the results would for sure disappoint.

Direct link | Posted on Feb 5, 2015 at 17:05 UTC
In reply to:

ecm: I still wish there could be some older cameras added as comparison points - it would make the samples so much more relevant and useful if I had in hand any of the cameras in the list....

I would love to see some significant cameras in the past, such as the D700/5DmkII, it would help keep the current cameras performance in perspective.

Direct link | Posted on Dec 23, 2014 at 05:54 UTC

More cameras the better!

I kind of wish there was some legacy cameras in there just for a point of reference. It helps us keep things in perspective.

Perhaps significant legacy cameras like the D700/5DmkII :)

Whoops didn't see the post down below about this.

Direct link | Posted on Dec 23, 2014 at 05:52 UTC as 21st comment
On BPG image format aims to replace JPEGs article (208 comments in total)

The sad thing is, if you are a jpg shooter, and your camera manufacturer can't even take the time to give you a decent jpg option, what's the likelihood that they will adopt something like this?

Direct link | Posted on Dec 16, 2014 at 14:39 UTC as 25th comment
In reply to:

Shiranai: Whats the difference between using this or just using a normal LED video light from say Yongnuo with 291 more LEDs and at the same time 12 times cheaper?
And don't tell me the only difference is, that it "flashes" instead of being permanently on.

Sorry, but it "flashes". That's the key difference, how can you tell us not to tell you that?

It's all about "duration", how long the flash is on. A continuous light us always on, so the "duration" is how long your shutter speed is, probably maxing out at 1/8000th of a second. You will get motion blur with very fast objects.

A hot shoe flash has quicker durations if you reduce it's power setting (as flash duration depends on flash power, or vise versa, since as the text indicates, flashes get more "power" by making the duration longer. At low power you may get 1/40,000th duration, which is a huge amount better than a continuous light.

However, this one promises 1/2,000,000 which is even better.

So to answer your question, the difference is that it flashes, faster.

Direct link | Posted on Dec 2, 2014 at 16:00 UTC
On Canon PowerShot G7 X First Impressions Review preview (947 comments in total)
In reply to:

Sviz: It looks like the range and speed of this lens comes at a price. Optical quality not in the same league as RX100M3.

http://www.imaging-resource.com/PRODS/canon-g7x/canon-g7xGALLERY.HTM

Agreed, some of the wide shots look horrible with fringing, almost looks like lens decentering.

What is more apparent to me is the horrible JPG processing. The G series usually have RAW though, so that'll be what I'll be waiting to see.

Also to note, even with a crummy quality of the lens, this camera will still shine at night, with it's big sensor and bright lens, the soft images won't matter too much, at least the images will come out better than other compacts out there.

Direct link | Posted on Sep 19, 2014 at 15:21 UTC
On Nikon D750 First-impressions review preview (1422 comments in total)
In reply to:

astigmate: As a D700 owner, I feel...hum kinda betrayed by Nikon. So, this entry level, crippled camera is supposed to be the D700 successor ?! feel like an FF D5300 !! I'm tired of waiting for them. I'll keep my D700 until it dies and will look into fuji or sony stuff now on.

Oh, btw, the Sony Full-Frame A7 (24mpx also) cost HALF the price asked for the D750 and it has 1/8000s shutter, focus peaking, nice EVF etc

Thinking more about it, and looking at some of my bright sunlight photos, I could probably get by with 1/4000th, given the lower base ISO settings.... *tempting*

Direct link | Posted on Sep 16, 2014 at 05:33 UTC
On Nikon D750 First-impressions review preview (1422 comments in total)
In reply to:

astigmate: As a D700 owner, I feel...hum kinda betrayed by Nikon. So, this entry level, crippled camera is supposed to be the D700 successor ?! feel like an FF D5300 !! I'm tired of waiting for them. I'll keep my D700 until it dies and will look into fuji or sony stuff now on.

Oh, btw, the Sony Full-Frame A7 (24mpx also) cost HALF the price asked for the D750 and it has 1/8000s shutter, focus peaking, nice EVF etc

Yes, bright primes in sunlight. Though, even at F2.0 or F2.8, if you are shooting in direct sunlight, shutter speeds can be a problem. On my D700 I shoot ISO 125 to get by (at 1/8000th often). At least the D750 has ISO 100, does it have low 1, 2, 3 as well?

Direct link | Posted on Sep 14, 2014 at 04:35 UTC
On Nikon D750 First-impressions review preview (1422 comments in total)
In reply to:

Galbertson: Rockwell states audio in jack for Nikon's own little stereo mic. Will other third party mics also work?

Even if you use an external recorder, there are benefits of piping the lineout of that recorder to get the audio internally in the recorded footage. Reviewing footage is one of them.

Direct link | Posted on Sep 12, 2014 at 17:42 UTC
On Nikon D750 First-impressions review preview (1422 comments in total)
In reply to:

astigmate: As a D700 owner, I feel...hum kinda betrayed by Nikon. So, this entry level, crippled camera is supposed to be the D700 successor ?! feel like an FF D5300 !! I'm tired of waiting for them. I'll keep my D700 until it dies and will look into fuji or sony stuff now on.

Oh, btw, the Sony Full-Frame A7 (24mpx also) cost HALF the price asked for the D750 and it has 1/8000s shutter, focus peaking, nice EVF etc

I'm mixed, besides the 1/4000 and flash sync of 1/200, two things that I actually will run into, it seems like a huge upgrade from the D700, which I'm also an owner looking for a successor.

Everything else is about perfect... man that shutterspeed though, as a guy who only shoots primes and loves shallow depth of field...

Direct link | Posted on Sep 12, 2014 at 17:39 UTC
In reply to:

D1N0: F4 is more compact and lighter than F2.8. On Full frame it is adequate on APS-c a bit slow. Price point is a bit high though for a less well known third party manufacturer. I wonder

Depth of field will be the same, angle of view will be different (making you have to use a different focal length or distance to subject) :P

Direct link | Posted on May 16, 2014 at 14:52 UTC
On Atomos launches Shogun 4K external recorder article (17 comments in total)
In reply to:

fdfgdfgdgf: In a few months all upcoming models will record 4K internally.

Just a few months? Sweet. Too bad the new 7S missed out by just a few months :(

Direct link | Posted on Apr 9, 2014 at 22:07 UTC
On Blackmagic Design launches Blackmagic Studio Camera article (23 comments in total)
In reply to:

InTheMist: Can someone explain to me what it is?

Ever seen a set of a TV news broadcast? You'll see cameras with big viewfinders on wheeled tripods. They'll look kind of similar. This like a mini/cheap version of that. big screen so that you get a good view of the framing without having to have your face right up to the screen.

It's a pretty niche market I would think, though, at this price, they could score big especially as broadcasters are trying to push to 4k content, this could be a cheap way to get their feet wet. Not to mention all the enthusiast media peeps who are building out small studios.

Direct link | Posted on Apr 8, 2014 at 14:42 UTC
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