November 23, 2014, 03:40:05 AM

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Messages - Lee Jay

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197
Read noise aside, larger sensors have more dynamic range.

Yeah, but that's misleading, because read noise scales (down) along with size (well capacity), so DR isn't strongly affected by pixel size.

198
Back up a second. So even if you shoot RAW the histogram in camera is only displaying the color space you've chosen?

And the in-camera processing (especially contrast and saturation) you've chosen.

199
I was not going to make a big case out of this, but what you see on the camera is what you see on the camera. You need to be able to read that properly. And yes, what you see there is nor correct, but you need to judge your settings based on what it tells you. At least that's what I do. The histogram I referred to was LR, looking at the Raw files. If that is incorrect also, I'd appreciate a clarification.

The default conversion gives you much less dynamic range than is available in the raw data.  Even if both highlights and shadows are clipped in the default conversion, using -highlights and +shadows may recover several stops of DR from the ends of the histogram.

200
I am still amazed over the number of posts this topic is able to produce. I hope Canon is paying us some attention.

To me it is rather simple. If I shoot images and the histogram shows I have covered what I wanted covered, I am, from a DR perspective, good. If the histogram shows that I hit either the floor or ceiling, I'm either irritated over a poor exposure setting, or, especially when I'm in the basement and through the roof, with shadows black and highlights blown, in the same picture, I want more DR. I have quite a few of those, where I have to choose which end I want to give priority and have black shadows or blown hightlights in the other end.

Yes, I could in some cases use HDR and bracketing, but as Lee Jay also points out, when things are moving I find that to be a poor option at best. People, wind in trees, flowing water etc. requires one-shot images.

For people to form their own opinion, I suggest they go back and study the histograms of some of their more contrasty images and see how many (if any) would benefit from more DR.

The in-camera histogram?  The histogram of the default raw conversion?  What histogram are you talking about?

201
Well I have to say I sure as heck could've used more DR the last few days. On a fast pace, with others some of whom were not into photograph, tons of ground to cover, often fast changing and soon fading light, so much to see, even when multi-shot tripod HDR would've worked only had time to set up the tripod once.

You don't need a tripod to shoot an HDR.  In fact, you don't even need one second.  Just shoot a bracketed burst, and use software to obtain perfect alignment in post.

202
Post Processing / Re: Fast editing of RAWs to "camera like" Jpegs
« on: October 04, 2014, 12:30:54 PM »
I haven't uses Canon's software in many years, but they used to provide something called Raw Image Task which would convert a raw image into a JPEG that was bit-for-bit identical with an out of camera JPEG taken in camera using raw + JPEG.  Do they still do that, or does DPP have similar functionality?

203
...I think in the end the D810 is really going to be the Exmor-equipped camera for landscapes.

I'd personally dismiss it for the lack of an AA filter alone.  I'd never be able to trust it for that reason.

204
Okay, I'll provide an image from a high DR scene, that's actually a picture I wanted, not just a test.  This was taken at ISO 100 on a Rebel T2i and it was exposed such as to reduce, but not eliminate, blow out of the raw data on the bright pixels at the top of the image.  In other words, this was about as much exposure as I could give it without further blowing out the raw data on the top of the frame.

See what you think of the technical performance here, by seeing what you can make of the image.

http://tinyurl.com/neof9y4

205
EOS Bodies / Re: Next Rebel Going EVF? [CR1]
« on: October 03, 2014, 02:06:27 PM »
Canon released a new EF-s lens this year - the 10-18IS STM.  They released two new EF-s lenses in 2013, the 18-55IS STM and the 55-250IS STM.

So, from March 21st, 2013 to now, they've released three lenses that cover a 16mm to 400mm equivalent zoom range for the EF-s mount.

You forgot the EF-S 24 / 2.8 pancake.
On the other hand i would not count iterations of the kit zoom or the 55-250 as "new lenses".

Gee...I didn't even realize the 24/2.8 was an EF-s!  I really pay very little attention to slow primes.

These aren't just version II, III and IV of the kit lenses (like all the 28-80s and so on), they are genuinely new in that they use STM focusing systems.  So I think they're worthy of being "new lenses" especially since they still sell the old ones.

206
EOS Bodies / Re: Next Rebel Going EVF? [CR1]
« on: October 03, 2014, 01:51:59 PM »
I just don't see Canon dumping EF-S any time soon...

But they're probably not advancing it further, either. Look at the last lens releases, esp. at the 16-35L/4 with IS with is just made to be a sturdy "standard" zoom on a 20mp crop camera...

Canon released a new EF-s lens this year - the 10-18IS STM.  They released two new EF-s lenses in 2013, the 18-55IS STM and the 55-250IS STM.

So, from March 21st, 2013 to now, they've released three lenses that cover a 16mm to 400mm equivalent zoom range for the EF-s mount.

207
Do you really believe the goal was to "preserve the view out of the window".

The goal was to do a dynamic range test BY preserving the view out of the window.

208
I see what you tried to do with this thread jrista, and while it does show that the A7R's sensor is superior to the 5D3's at the settings you used, unfortunately the fanboys have gone on the defensive and resorted to borderline bullying.

He has deliberately drastically under exposed to try to prove his theory.

The images are NOT underexposed if the goal is to preserve the view outside the windows.  In fact, some of the pixels from the windows are blown out in the raw data.

Now, if you don't mind all-white windows, then the images are underexposed.

209
EOS Bodies / Re: Next Rebel Going EVF? [CR1]
« on: October 02, 2014, 11:02:23 PM »

I really don't want smaller, except for my pocket camera.  My 35/1.4L is too small for me.  My hands aren't getting any smaller, so why do I want my cameras to get smaller?

I'm over 6' tall, wear size 13 shoes and have hands to match ;) And I prefer holding a Sony NEX over any of my Canon Film SLR or DSLR cameras. YMMV, but please don't tell me what I should or shouldn't like.

I'm 5'6" and wear size 7 shoes, and my 5D and 70-200/2.8 is the easiest and most comfortable combo I've ever used.  I can use if all day every day with no trouble, but a Rebel and 15-85 killed my hands after just an hour and a half - too small.

210
Lenses / Re: What New Lens are You Most Excited About?
« on: October 02, 2014, 10:20:46 PM »
I put down the C (Contemporary) version of the Sigma 150-600, and here's why.

The S (Sport) version is too heavy and too expensive to compete directly against the Tamron 150-600, and I suspect that's why Sigma is producing it and why it's later than the S version (it might be a reaction to the Tamron).

The Tamron is soft above 400mm and wide open.

That's why I'm interested in the C version - the Sigma interview guy said it would be about as good optically as the S version except for the corners on full-frame at the long end.  Well, I'd be using it on crop, and the S version looks to be quite good.

So, the C version might be just what the Tamron needed to be - sharp wide open at the long end.

And that would make it interesting to me.

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