Gear Talk > EOS Bodies - For Stills
1Dx ISO100 high DR shadows SNR improvement
Neutral:
One of the weak sides of the 1Dx is noise in deep shadows at base ISO.
It seems that nobody is arguing about that any more.
DXO 1Dx measurement results also show that very clearly on their measurement curves.
And I believe that nobody would be arguing that performance in this area is very critical for not just few people but for many people - for landscape photography, evening/night city shots and other sort of photography.
Though it is easy to argue that that Nikon D800 would be the better choice BUT why not to see how we could get better deep shadow SNR from 1Dx.
In one of my posts I mentioned that 1Dx has a very nice feature that could be used for that.
I will not name it now (will do at SOME next post) but here is some magic - example how it works (snapshots from LR screen - noise reduction is totally disabled )
1. First image shows 1dX shot at IS100 with EV=(-3) the Data Color noise calibration chart which was used for Noise Ninja NR S/W and PS plug-in. Shot with manual Out of Focus to blur target texture so it would not interfere with noise
2. Second one is the same with Exposure slider in LR set to +3 - looks the same as normal shot with EV=0
3. Third image is 200% crop of shot with EV=0 showing normal 1Dx ISO shadow noise
4. Fourth one is 200% crop of the EV=-3 shot with LR exposure set to +3 to raise shadows to normal level.
Level of 1Dx noise at ISO100 at -3 EV shadows is very clearly seen
And next post is little bit of magic - the similar EV=(-3) shoot from 1Dx recovered in LR - 200% crop to see the difference in SNR for random nose with the previous shot.
Neutral:
OK, now is 200% crop of the similar EV=(-3) shoot from 1Dx using some special shooting method with 1Dx .
Shadows are recovered in LR with Exposure slider set to +3 to compensate for in camera EV =(-3) . No noise reduction in LR.
Note how SNR for random noise was improved.
So we have almost two stops improvement here for random noise SNR.
This means that with normal exposure it is possible to successfully recover details in very deep shadows at ISO100.
We still see some slight pattern noise on the image but I believe that there is some NR software that doing very well with reducing pattern noise - might be Topaz De-noise but not very sure as I do not have that.
If all combined together with some special shooting method with 1Dx it is possible to get shadow SNR on par with Nikon D800.
So now quiz - how this was done?
victorwol:
No clue, but would be nice if you can share it. It's very interesting for sure.
neuroanatomist:
The suspense isn't killing me. ::) But feel free to share, when you're ready...
Viggo:
Bring it on! :D
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