Re: Inverse vignetting?"

[P3D Carrano, Allan <allan.carrano@xxxxxxxxxxxxx>]

>I think the term vignetting is used for loss of light at the edges, not
>loss of sharpness.  I cannot think of anything that would cause this,
>except for what Dave suggested:

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

First, thanks to all those who posted their thoughts on the "vignetting
of focus" problem I brought up a couple of digests ago.  Note the
quotation marks, Dr. T.  You are right.  Technically, vignetting is a
falling off of light rather than focus.  Besides "framesplitter," how
about coming up with a name for the phenomenon I've described?  I'm
assuming no such name exists.  Am I wrong here too? :-)

Until I get to look at Wanda's camera again to see if there are any lens
abnormalities, I'm going to assume that warm moist air is the culprit.
Hurricane Fran was here in Raleigh, NC a week ago.  She left 8.2 inches
of rain in less than a 24 hour period.  Also, it has rained here all
this past week, and temperatures hovered between 85 - 90 F.  

Thanks again for your thoughts.

Allan Carrano  


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