I'm doing some research on this now but I figured I'd ask here in case someone had an answer.
In some experimentation I have used aperture cards with large and non-traditional optics But, I wish to mount a mechanical iris as it is much easier to more fluidly change the F number.
I was curious to know the effect (if any) of positioning a mechanical iris / aperture in front of a lens instead of behind it (inside the barrel).
Also, if there is any visual effect if the distance between the aperture and the optic element is (too greatly) increased.
Essentially,
I hear that barrel lens are a mixed bag (optically) but also due to some being difficult to fit with an aperture. Exposure time is not a factor in my project (Scanner camera) so it seems easier and cheaper to make a mount where an iris / aperture would sit in front of any lens / optics that did not already have a working aperture / shutter.
I would in turn also mount lenses (mostly barrel) more recessed or flush to the board for better camera balance.
Thoughts?
(any lens/optics physics-technical answers are fine. I'l try to follow along and look up the parts that i don't fully grasp)
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