Diffraction.
Paul
At 10:17 PM 3/21/00 EST, you wrote:
>Thanks to Gary R. and John Hudson for pointing me to the URLs for 50mm lens
>comparisons. Funny thing is that I have looked at Gary's tests dozens of
>times but never taken the time to browse the 50mm lenses. Oops!
>
>Okay, so here is my new question:
>I'm getting into macro work and have noticed a somewhat annoying phenomena.
>If I maximize depth of field (or at least preview to get the subject in
>focus), the subject is in focus but definitely muddled. With a shallow DOF,
>the subject is out of focus, usually, but the parts that are in focus jump
>out at me.
>I have three thoughts on the source of this:
>1) a loss in contrast of a particular lens at smaller apertures
>2) some sort of optical trade-off of a larger DOF in all lenses
>3) or just my own eyes distracted by other items in the frame becoming more
>in focus
>Any thoughts on the cause and solution to get the subject in focus and
>preserve 3D effect? I am trying to solve the problem by using lenses at
>their optimum aperture and also trying to set the depth of field for just the
>subject. Two tasks which are not exactly complementary in macro work.
>Anybody else have/had this problem? What are/were your remedies?
>
>--p.j.
>
>< This message was delivered via the Olympus Mailing List >
>< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
>< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
>
>
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|