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p.1 #1 · p.1 #1 · 7D,20D,40D,50D,5D2 DR at all main ISOs: (EDITED) | |
NOTES:
MAJOR EDIT: I forgot about the ISO rating differences between the cameras, this doesn't matter at all when talking about max DR but it does when you are comparing at all sorts of ISOs like this, the 5D2 and 40D probably need a bit of a penalty here compared to the 20D, the 50D too although not quite as much as the 5D2 and 40D, I don't think. Not sure about the 7D but it sounds like it might be rated similarly to the 50D. I suppose I could find the values from DxO and plug them in for each camera instead of the 100,200,400,etc. I used for each to make the plots fair.
Remember the 50D and 5D2 pattern band worse and the 7D the least so the realistic values might penalize the 50D and 5D2 a bit and boost the 7D a tad.
Remember SNR at 18% will give a pretty large boost to the 5D2 compared to the APS-C cameras. The APS-C should all be reasonably close with the 7D best then 50D then 40D then 20D just guessing by photon collection technology. But it is really the sensor size, at this point, that makes by far the largest difference.
Remember color depth was not tested here either.
The 40D tested was better than most copies. The 20D tested was worse than most copies. The 7D tested was pre-production using the mask area only.
COMMENTS:
The 7D appears to be the first DSLR where going above ISO1600 makes full sense
when shooting RAW (compared to pushing and pulling in post from ISO1600). The ISO3200 appears to truly be real in all senses of the word.
At ISO800 and up the 5D2 advantage might be realistically noticeable, for DR, compared to the others.
At ISO1600 and up the 7D advantage might be realistically noticeable, for DR, compared to the 20D and 40D (and probably compared to the 50D because of the pattern banding difference).
The 5D2 doesn't really lose any noticeable DR until you go above ISO800 but the APS-C start losing it above ISO400 (or one might say the 5D2 doesn't gain as much as it should at low ISO perhaps). That said, of course you are letting a lot less light hit at ISO800 than ISO100 so you get a lot more shot noise (but it's still not too bad on a 5D2 really).
In terms of 'pixel level' DR they are all essentially identical (aside from the 20D) until you go above ISO400 and then the 5D2 is a bit better (although considering the banding differences, realworld, you might need to get to ISO800 or more to seem better than the 7D).
Probably of most relevance is how the 7D will AF.
RESULTS:
OK, at left is 'pixel level' and at right is all normalized to 20D size:
http://skibum4.smugmug.com/photos/647484983_kzrMG-X3-1.jpg
and in plot form normalized, compressed Y-axis for easy viewing:
http://skibum4.smugmug.com/photos/647485653_nMqKN-X2-1.jpg
EDIT: here is the version where I tried to normalize for ISO (plotted the 7D three times depending whether it acts like the 50D,40D or 5D2):
http://skibum4.smugmug.com/photos/647621523_z8khz-X2-1.jpg
and same but full Y-axis to give a more realistic feel for what the differences actually imply (makes lots of it all seem more trivial as it is):
http://skibum4.smugmug.com/photos/647485313_NsQ2E-X2-1.jpg
EDIT: here is the version where I tried to normalize for ISO (plotted the 7D three times depending whether it acts like the 50D,40D or 5D2):
http://skibum4.smugmug.com/photos/647621906_7vqpQ-X2-1.jpg
EDIT: did NOT redo these below to account for ISO differences:
and compressed Y-axis plot at the 'pixel level':
http://skibum4.smugmug.com/photos/647484281_sBHeG-X2-1.jpg
and full Y-axis:
http://skibum4.smugmug.com/photos/647484531_y5kgz-X2-1.jpg
and full-details:
http://skibum4.smugmug.com/photos/647486147_XXPua-XL-1.jpg
http://skibum4.smugmug.com/photos/647486488_TKrwY-L.jpg
Edited on Sep 12, 2009 at 11:05 PM · View previous versions
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