Previous versions of brainiac's message #7625603 « Canon EOS 7D Master thread »
brainiac Offline [X]
Re: Canon EOS 7D Master thread
jorkata wrote:
Here’s a quick math that I did for fun:
The 40D and 1D3 are both 10mp cameras.
The difference in sensor sizes results in a 5.7µm vs 7.2 µm pixel size difference (see the pixels sizes here).
That’s less than 25%.
So, with ~25% larger pixels, the 1D3 has about 1.5-2 stops ISO/noise advantage over the 40D.
The pixels size of the 7D (18mp) is 4.3µm.
This is ~20% smaller than 5.2µm, which is the pixel size of the 450D (12mp).
What that means is that, in theory, if Cannon applies the 7D same sensor tech to a 12mp camera, this camera will have almost 1.5-2 stops ISO/noise advantage over the 7D.
In other words, if the 7D had ‘only’ 12mp, its ISO/noise performance would have been the same as the 1D3 (almost).
Imagine that !
A lot of people welcome the 18mp sensor of the 7D but not all.
Instead of having a single choice of an 18mp sensor, Canon should also have a 12mp version of the 7D with the incredible ISO of the 1D3.
We won’t be arguing on these forums anymore – everybody will get what they want.
However, your determination to ignore the clear evidence that has already been put in front of you on this thread suggests that you may never understand that per pixel noise isn\'t a measure of how well a camera takes a picture. All I can say is that you are wrong in your assertion that the 7D is worse than previous crop cameras in terms of noise at isos above 200. There are examples on this very thread of it smacking the 50D, and I think it is highly likely that it is a better camera at isos 200 and above than the 1Dmk3. Of course, to ascertain the truth of that, a per pixel analysis like yours will not do, as it will be completely misleading to compare 100% crops from 10 and 18 Mpixel cameras. The 1D3 file will need to be uprezzed to 18 Mpixels to make a fair comparison on screen, at which point I think we will see that the greater technological maturity of the 7D will overcome the 1D3\'s sensor size advantage, perhaps even before appropriate chroma noise reduction is applied. It\'s clear to me, jorkata, that you simply haven\'t understood these issues at all, and the opinion that you are proffering here isn\'t based on experience of comparison of real output.
Oct 11, 2009 at 05:34 AM
Previous versions of brainiac's message #7625603 « Canon EOS 7D Master thread »
