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5Dc vs. 5DII red noise and hues
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PostPosted: Mon Jul 11, 2011 4:03 pm    Post subject: 5Dc vs. 5DII red noise and hues Reply with quote
As I often discover more red noise in photos made with 5DII than with 5Dc I tried today to compare both on same subject, with same lens, at same settings.
I used APO-Macro-Elmarit 2.8/100 stopped down to f11, tripod, 2s mirror-up and IR remote for 5DII. WB fixed to daylight on both cameras. All images was made within 15 minutes inside with indirect daylight, so I hope there was not much change in lighting.
I applied exactly same settings for all cr2 files in DPP. My standard settings, only slightly lowered reds in RGB tab to get some details (I don't understand the default overblown reds in DPP).
5DII JPEGs are resized to resolution of 5Dc for simpler comparison.
And sorry for the dust on 5Dc, best feature on 5DII is definitely the sensor cleaning! Wink

Please don't compare in web browser, my Firefox renders flatter colors on 5Dc files than DPP or Photoshop. Maybe some problem with embeded ICC profile.

My conclusions:
- even if I used same shutter speed for same ISOs, the 5DII underexposes 1/3EV in comparison to 5Dc. So I applied -0,83EV correction for 5DII and -1EV for 5Dc in DPP.
- ISO50 is better to avoid on both cameras. Noise is clearly lowest, but in the highlights you can see loss of details due to narrower dynamic range.
- 5Dc shows lower quality loss on intermediate ISOs (on 5DII they are fake ISOs, no surprise here)
- 5Dc red shadows looks cleaner to me at same ISOs than 5DII, even on resized images :-/
- 5DII shows more hues in middle tones on my EIZO and the resulting image looks with more "relief" or "3D" to me. (12-bit vs. 14-bit ADC?)

What do you think? And your experiences?

If anyone is interested in original cr2 files, I can upload them somewhere.

5D classic ISO50,100,125,160,200,250,320,400


5D mkII ISO50,100,160,200,320,400


PostPosted: Mon Jul 11, 2011 5:12 pm    Post subject: Reply with quote
My theory is IR 'pollution' in the red channel. IR from scene plus IR from sensor heating. I don't have 5DII. Theorize there is more of this IR 'noise' captured because of higher pixel density.


PostPosted: Mon Jul 11, 2011 5:21 pm    Post subject: Reply with quote
I am not seeing meaningful differences.
That the 5D2 is a bit more noisy than the 5D, is in the nature of the things, given that the 5D2 packs 80% pixels more into the same sensor area.
On the other hand, the AA filter of the 5D2 is reportedly a bit less strong than that of the 5D, this makes the 5D2 a little bit sharper than the original 5D. The pay off is a smoother image in the 5D.
But we are talking minutia, under all respects.
Like I said, I do not see meaningful differences.


PostPosted: Mon Jul 11, 2011 5:38 pm    Post subject: Reply with quote
nice job, not easy to put focus on the same point with this flower
I don't have a 5Dc but your test show that a 5Dc is still great to enter FF


PostPosted: Mon Jul 11, 2011 9:18 pm    Post subject: Reply with quote
visualopsins wrote:
My theory is IR 'pollution' in the red channel. IR from scene plus IR from sensor heating. I don't have 5DII. Theorize there is more of this IR 'noise' captured because of higher pixel density.

Yes, this is possible. Probably result of "cheaper" electronics to lower production costs in comparison to 5Dc and to differentiate the camera more from 1DsIII.

Orio wrote:
But we are talking minutia, under all respects.
Like I said, I do not see meaningful differences.

Yes, the differences are minuscule. Actually this quick comparison is side product of my searching for correct exposure and ISO for red objects like this flower. As most of my shots of this kind are killed by red noise. Looks like ~1EV overexposure does good job for keeping noise low and still get good details in highlights.

I'm new to FF and still learning. I've got 5Dc in October last year and 5DII in March. I was really astonished by the IQ of 5Dc in comparison to my Pentax K20D. Unfortunately the 5DII was a little disappointment then. Maybe the expectations was to high.
As amateur I really don't need two FF cameras and I plan to sell one in near future. As I don't do video and the IQ is so close I still can't decide if the 750€ difference is worth of these 4 important features which 5DII offers me over 5Dc.
1. auto ISO - I can use Tv mode with manual lenses. This si great for reportage style photography. I set minimum shutter speed (usually 1/200s) and let the camera compute ISO or higher speed when possible. Good for shooting with longer manual lenses too.
2. sensor cleaning
3. better display
4. live view (but I can do without it)

I'm still thinking about selling 5DII while prices are high and wait for 5DmkIII (if there will be any) and then go for new or used mkII at lower price or straight to mkIII if the difference in IQ and features will be worth.


PostPosted: Thu Jul 14, 2011 5:01 pm    Post subject: Reply with quote
If you do not hurry to sell Brunner I could do business with the 5D2's body in the autumn. If we get the price of the contract. New in Finland is now less than 2000 €
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