[LRFlex] Re: 20D Question
- From: Karen Nakamura <mail@xxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Mon, 14 Feb 2005 11:19:44 +0900
at I was asking, is why do the digital lenses have lockout lugs so
that they cannot be used on film bodies, if in fact that they are
better????
Two reasons:
* Less area coverage. Many "digital-only" lenses only project enough
of an image circle to cover the APS-C size sensors. They don't have
enough coverage for full-frame digital cameras or for film cameras.
* Canon EF-S lenses have less "back focus". The rear of the lens
extends further into the camera body than normally, this makes it
easier to design at a lower cost level, but it would smack into the
larger mirror of film SLRs or full-frame digitals.
Karen
Karen Nakamura
http://www.photoethnography.com/ClassicCameras/
http://www.photoethnography.com/blog/
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