----- Original Message -----
From: "Chip Louie" <[EMAIL PROTECTED]>
>
> Was just wondering something. I recently suggested that someone with a EF
> 28-105USM and a vignette problem try testing wide open and stopping down
> until the problem went away to see if the problem was the lens or the
> filter. Henry P. said that lenses that vignette will be at their best
when
> wide open and get worse as they are stopped down.
>
> This is just wrong in my experience and there was a long string of trying
to
> explain the whys and wherefores by many others. I just watched as it got
> silly and must have missed the end of it. The recent mention of the
French
> magazine CD and their test results on vignette refreshed my memory and I
> wondered if after all of Henry's insistence that he was correct if he ever
> said he was mistaken or if everyone else just gave up?
>
Chip
Is there not perhaps a difference in 'in-lens' vignetting opposed to
vignetting because of an external filter? My experience with putting a Cokin
filter holder on my 20-35/2.8 (before I cut the last two slots out) was that
vignetting definitely got worse as you stopped down. The Vignetting was not
visible through the lens at all while focusing (never tried DOF preview) and
all my slides had their corners badly blacked out. I had the same effect
once when I accidentally put the lens hood on without lining up the little
red dots.
Regards
Thys
---------------------------------------------------------
Thys van der Merwe
Portfolio of African Images:
http://home.mweb.co.za/te/teknovis
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