The comparison that I am trying to make is nothing else than comparing \"pixel noise\". I do know that this term does not really exist for you because you want to look at the whole image and capabilities of a camera in this respect.
If you want to compare cameras, then you should look at the same image from each one. It makes little sense to compare different fractions of the image. If you\'re saying you want to use a higher MP camera for its greater \"reach\" (greater ability to crop while retaining sufficient detail), then fine, the higher MP camera can do things the lower MP camera cannot. It is not the case that the lower MP camera can do things the higher MP cannot.
I wanted to look at the same number of pixels images to see if 10 Mpixel images taken out of 18 Mpixels will give a better image than 10 Mpixels of 40D. If that is the case, everything is completely clear to me as far as the progress Canon has made. If not, I will have to find out what size of 7D full image crop is equal to 40D\'s image.
The 10MP mRAW images are nothing more than the camera downsampling the 18MP to 10MP. This is about the crudest form of NR one can do, as it throws out image detail at the same rate it throws out noise. Better is to use one of the good NR filters (NI, NN, etc) to filter out the noise while retaining more detail.
However, if 10MP is what your heart is set on, the 7D should provide a cleaner 10MP image than the 40D -- the 40D at the pixel level will have more demosaic artifacts and the effect of the AA filter will cause the image to be somewhat softer than the downsampled 18MP image, whose demosaic artifacts and AA filter blurring are at scales that will be smoothed away by the downsampling.
Oct 11, 2009 at 10:04 AM
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