>If the Sigma 14mm is like the 400 F5.6 APO Sigma I own, the build
quality
>will be good, but no Zuiko. Lepp compared the Sigma 14mm lens to the
Canon
>and said that the sharpness was " up to the standards of the other
two." A
>friend has this lens in a Minolta mount and I got a chance to use it
when we
>visited Arches N.P. and Natural Bridges N.M. This lens is a special
purpose
>lens, but it is a lot of fun to use! Gary Faulkenberry
>
I've been pleased with the quality of the photos taken with my new
Sigma 28mm f/1.8 and old 18mm f/2.8. All the new Sigmas have
polycarbonate bodies, which appears to be just fine to me. There is a
threoretical advantage of plastic over aluminum in that the latter
changes dimension a lot more than the former. This means that the
position of the glass may change more with temperature in an aluminum
barrel than in a poly one.
I still have some K&E slide rules made from plastic just for this
reason.
Be seeing you.
Dirk Wright
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