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Article:
  A Photographer's Review of the Canon EOS 10D Digital SLR
Subject:   Focal Length -- it's like higher resolution
Date:   2003-10-30 20:43:16
From:   anonymous2
Response to: Focal Length -- Well...

if you crop an image, you rae losing image quality, but reducing the number of pixels in the image (assuming you stretch it to its pre-crop size,) if you took a 4MP image and cropped it to a center portion, you would not have as good of quality asif you cropped the same frame in a 6MP image. this is the effect that the magnification factor gives. That is it crops the image a certian ammount while not sacrificing image quality. So you dont get the same light loss or depth of feild changes as you would with a longer lens, but the practical effect is the same