John Black wrote:
By IQ you mean sharpness, right? If so, then I think that's where things are getting confused. Dynamic range in this post refers to how much range can be captured before highlights are clipped and before shadows go to pure black.
I completely understand that. IQ is far more than just sharpness, at least to me.
ejmartin wrote:
IQ has many aspects, sharpness is but one; S/N ratio is another; DR yet another.
Pixel pitch refers to the distance between pixels. For instance, the 1D3 has 3888 x 2592 pixels on a sensor of size 28.1 x 18.7 mm, so the pixel pitch is 28.1mm/3888 ~ 18.7/2592 ~ 7.2 microns.
this of course assumes no loss of Any space for micro lenses etc right ?
jmcfadden wrote:
this of course assumes no loss of Any space for micro lenses etc right ?
I think I have it right, and it's independent of those considerations -- no assumptions necessary. Notice I didn't say it was the size of the pixels, merely the their spacing.
So just to clarify - the only setting we maintain is Brightness at +50? Mine defaults with Blacks at 5 and Contrast at +25. Leaving them on clips my shadows very prematurely I think (I end up with 7 1/3) ...While turning all to zero except Brightness left me without enough frames to test even though I went 11 clicks below EV -2 -- the last frame was still not clipping. I am using a 40D BTW.
So, if I did it correct and turned all sliders to zero with the exception of Brightness at +50 (and of course the white balance settings were left as is), I ended up at 9 1/3 (from 2.5s down to 1/250 sec.) -- but I ran out of frames and could have gone further below 1/250 sec. without clipping.
Let me know if I did the test correctly with turning the Blacks setting to zero and Contrast to zero and leaving the Brightness at +50 and I will retest to get a more accurate number.
EDIT: Nevermind - it appears I was doing it right and didn't account for the trailing tail in the histogram - even though the peaks had completely moved away from the left side, there was still that small one-pixel tall tail that didn't separate from the left axis - I could be wrong, but I suspect a couple of others in the database may have missed this too. So I remeasured at 8 2/3 for my 40D
Here are my results for three different bodies tested in immediate sequence. I used the latest version of ACR, and tried to be as consistent as I could. The separation of the shadow tail from the base was clean, as was the highlight separation from clipping point.
1ds mk 2 I got a 9 2/3 result. Quite consistent with the results you are getting. I am pretty sure I did it properly. My tests are consistent with the way others have done it. (acr etc.)
and tell us what it means ?
I don't think you actually don't know 