> Technically speaking, to the best of my knowledge, pretty much all
wide-angle
> lenses vignette to some extent, in the sense that the corners of the
image are a
> bit darker than the center 70%. What I had in mind was the very
noticeable
> darkening that occurs when a filter mount intrudes into the frame
sufficiently
> to register on the film. Not exactly the same thing.
That was why I was sceptical of the "does not vignette" statement.
The aperture is defined, strictly, for axial pencils (beams of light).
Wide open to maximum aperture ALL wide angle lenses vignette to some
extent. Note: I'm not talking cos4 fall-off. The difference with
adding filters is that you start to get noticeable vignetting at all
apertures, even f22.
I keep meaning to put my shots from the 20mm up (taken of a large
evenly-illuminated surface. That quantifies vignetting. But without
a comparative series from the 20-35 it would not be fair.
Anyway, digitally it is easy to remove vignetting from a scan anyway
unless it is too pronounced.
Bob
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