Mon 18-Mar-13 12:53 AM | edited Mon 18-Mar-13 12:55 AM by dm1dave
I **think** that the difference in dynamic range between a full frame image and one shot with the same sensor that has been cropped (i.e. DX crop mode or cropping in post) is based on output and viewing distance.
The calculations assume that you are printing (outputting) both images (cropped and un-cropped) at the same size and viewing them from the same distance.
This is that same issue that causes the Depth of Field differences between DX (or DX cropped from an FX sensor) and FX.
If you are making a 10” x 15” print - the full frame image will have less visible noise and better dynamic range than a cropped image printed at the same size that was shot with the same senor.
This applies to any cropping of any image.
If I am incorrect I hope that someone will jump in to help us out.