This must be one of the guys buying up the 18 and 21mm OM lenses.
See: <http://www.sphoto.com/techinfo/dslrvsfilm.htm> where he says
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Lenses are just not as sharp at the edges and in the corners of the
image area as they are toward the middle. The sub 35mm sensor equipped
DSLR crops out the side and corner areas of the lenses covering area.
So, most of your image is being produced from the very center of the
lens's covering area where it is at its sharpest. If you want to make
technically superior quality big prints from a full size sensor 16.7mp
DSLR, you better have good glass. The only focal length range that this
is a significant issue is Canon's super/ultra wide angle lenses (24mm
and under). Canon just doesn't have lenses in this focal length range,
zoom or fixed, that remain decently sharp in the corners. If you own a
Canon DSLR and you are a super/ultra wide angle fan you should encourage
Canon to make some decent lenses in the 24mm and under focal length
range. For the wide angle photography fan there isn't going to be much
advantage to adding more megapixels to Canon DSLR cameras until there
are lenses capable of taking advantage of all that resolution.
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The full page actually discusses digital vs. film resolution comparing
4x5 film, 35mm film, Canon 10D (6MP) and Canon 1Ds Mark II (16.7MP).
Interesting read.
Chuck Norcutt
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