re: Inverse Vignetting?

[P3D Section of Epidemiology <dworrell@xxxxxxxxxxxxxxxxxxx>]

>Allan Carrano>There were three slides that appeared to be
poorly focused in the central area of the frame, but were
sharp (or sharper) in the peripheral area, a sort of
inverse vignetting.  No there was no Vaseline in the center
of the lens.  

>Allan Carrano>What I want to know is, is this a phenomena
that is known and something that I'm just not familiar
with, or is this some very unusual behavior?

My most likely guess would be lens fogging - was it a moist
day?

Dave Worrell
Publications Technician
State of Alaska
Section of Epidemiology


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