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2

Years ago, I fitted enlarger lenses to high-speed photofinishing printers I using this this math. It proved accurate enough. Now for the gobbledygook: The negative carrier masks the negative plus we desire some over-spill at the easel. I use an over spill of 1.5% otherwise easel placement to avoid shabby borders is laborious. We now figure magnification ...


4

The recessed board helps in focusing a very short focal lenght enlarging lens (say 30mm, the kind used for enlarging 110 film). A short lens requires such a short distance from the film plane that the bellows extended to minimum would still not suffice, and had to be recessed. This was common issue only for lenses for smaller format that 35mm, which was ...


-1

Lenses are fitted to cameras and projectors (enlargers are subset of projectors) based on the diagonal measure of the film format. As an example, for 35mm film, the format is 24mm by 36mm with a diagonal of 43.3mm. This corner-to-corner measure is somewhat unconventional, talking about lens focal length, thus it is industry standard to round this value up to ...


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