Hello all,
I think I have figured out why dark images of the aperture show on my recent
prints. It goes like this.
The whole image comes from quite bright conditions. Even stopped down to
f/8 at 100 asa the camera was complaining that 1/2000 was not fast enough -
depending on exactly where I had it pointed.
Direct sunlight was probably entering the lens and going right through to
strike the interior side of the barrel behind the aperture blades and creating
a
bright patch (secondary light source). The front side of a rear lens element
also was illuminated enough to create a tertiary light source from another
angle.
The rear side of the aperture blades - now in stopped-down position - were
illuminated (even matt black will radiate something if not extremely black)
and then radiated this light towards the film; this light was focussed by the
rear lens elements.
Thus all of the film image received an extra dose of white light; all that is,
except the parts (two in these cases) where the empty space of the aperture
did NOT reflect / radiate light to the film. These two hexagonal spaces (two
sources involved) are therefore darker.
Therefore no dead pixels involved. Poof (*@*) goes another theory.
IMO
Brian
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