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Originally Posted by kennygee
Adey,
Thanks for the reply.
To satisfy my curiosity, what is it about the EF-S fitting that makes them more suitable for DSLR's. How is the shorter back end an advantage? To put it another way, how are they more suitable than the EF fit?
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Basically the smaller image circle gives the optical designer more freedom. In principle they can get a higher quality image in part because the lens can be designed such that light rays are mostly perpendicular to the sensor as opposed to at an angle. This is best of for the sensor. The jargon term for this is telecentric. In addition the lens can in principle be smaller and lighter. However, in practice APS sensor compatible lenses do not seem to be smaller or lighter than full frame equivalents. And as to whether or not they are better on APS cameras than full frame lenses, well ... who knows.
Leif