My situation - I built a low altitude aerial camera based upon a Zeiss 75mm lens. It is superlative with fixed focus at infinity. Very cool. Now I would like to bring its use to earth with just a few fixed focus distances.
It is convenient that it accepts 138mm filters which are rather common in cine applications. Cine photographers are technically astute so I am thinking of getting one or two diopter lenses, or how many it requires to do some land-level images. (Sure there may be image compromises but I'm good with that in LF.)
Sorry for so many words when my question is: what numerical diopter strengths do I need to bring this wide-angle 75mm to focus at specific distances such as 3', 15', 50' and so-forth?
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