Thomas,
can you explain? I thought because the 10D only uses the middle of a lens (sweet spot) and not the corners it should not be very critical comparing to full siza (film or chip).
Also because the pixels of a digital SLR are larger as a point and shoot.
Do I miss something
Thanks Leeuwtje
You're right that using only the central part of the image helps the image quality. OTOH, using a smaller (than 35mm format) sensor means, that you will have to enlarge more to get the same print size. And that hurts image quality. Lens designers always have to find a compromise between cost, weight, size on one side and zoom range, maximum aperture, image quality on the other side. A lens is "good enough" for 35mm format when it can produce an apparently sharp 20x30cm print. Now, using a digital SLR with a smaller sensor means cropping the original image and still produce a 20x30cm print. This means you have to have a sharper image to start with in order to get the same quality print. The effect of enlarging more costs more quality as you gain by using the central (and best) part of the image only. Otherwise, noone would buy a TC and we would all just crop our images. Of course there's also the grain issue in film, another reason to favor the TC over cropping. But the finite resolution of our lenses is also a part of the equation.
Thomas Bantel
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