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M39 enlarger lens image circle

Started Apr 28, 2018 | Questions thread
petrochemist Veteran Member • Posts: 3,619
Re: M39 enlarger lens image circle

D Cox wrote:

A "simple step down ring" is likely to have threads of filter pitch, which is much finer than the threads on lenses. What you are suggesting would be called an "adapter M39 lens to M42". It should be easily found.

I'm not aware of any filters in M42 size, there are two types of M42 lens mounts, M42x1 (usually called 'M42' or 'Pentax screw') & M42x0.75 (usually called 'T2' but annoyingly some suppliers just use 'M42')

I've not seen any filters in M39, but admittedly there is a m39x0.5 size around.

Searching e-bay for 'M42 - M39 step' I got 28 hits, only two of which referred to the filter thread. Most hits specifically mentioned lens mount.

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