I finally found some time to put together some home-made "Wollaston Landscape" and "Verito Portrait" lenses made from supplementary lenses -- AKA, close-up filters.
I'm pleased with the results, and created a couple of tables that I can use to simplify their use -- and I thought to pass them along. They are only useful to me because they largely apply to my lenses & shutter.
The first table estimates the focal lengths that can be created with combinations of supplementary lenses -- on the front or rear of a shutter (on any film format). Whether the lens will cover the format is a separate issue.
The second table estimates the f-stop for each focal length at using the maximum diameter of my shutter. My Polaroid shutter does have an adjustable diaphragm, but I'll probably only use it wide open.
At this point, a #0.5 lens on the front and a #10 on the rear -- producing a 95mm f4.3 lens -- looks like a winner. It easily covers 4x5 and I'm quite surprised at the quality.
www.subclub.org/cufocallength.jpg
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www.subclub.org/cumaxfstop.jpg
Attachment 236345
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