Guess nobody would be able to answer your question without actually looking
at the lens. I suggest you inspect the focus accuracy through the viewfinder
and see if AF was accurate. I have read many times that AF Sigma lenses have
the tendence to deliver incorrect AF. However, since I have no Sigma AF
lens, I cannot tell much. Another possible cause is you were shooting at
wide open. Sigma lenses aren't exactly very sharp at wide open, in general.
Misalignment is another possible cause, but I don't know much about it
because my Pentax lenses have never had this problem (due to the way they
were constructed).
regards,
Alan Chan
I recently bought a Pentax MZ50 with the 28-80 Sigma lens. The photos taken
with this camera are consistently less sharp than those taken with my Espio
95wr. I have tried Kodak & Fuji films of various speeds and the results are
always the same. Is this normal for the Sigma lenses supplied with the
MZ50,
or have I got a faulty lens?
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