M42 to Nikon-F adapter
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Yet another minimal M42 to Nikon-F adapter with aperture pin control.
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Yet another minimal M42 to Nikon-F vintage camera lens adapter with and without aperture pin control.
Tested to work with Helios 77M-4 and SMC Takumar 50/f1.4 on Nikon FG, D800 and D5500 bodies.
This adapter will improve the maximum focusing distance with unmodified M42 lenses by keeping the flange distance as short as physically possible. Do not ask for/about infinity. It is physically impossible to achieve infinity without additional optical elements or lens modifications. If you're looking for an adapter for the famous Helios 44-2 with infinity focus, check out this model. That specific lens is very easy to modify at home without any additional tools and without compromising its optical design. Get it if you don't have one yet. The lens is a painter.
Print in the finest quality your printer can achieve. Use elephant foot compensation - the tolerances are tight. Apply a bit of some lubricant onto the thread before screwing the printed adapter on. Use this lens cap by @StepanBroz_131676 as a wrench for screwing/unscrewing. It should not, by design, be possible to tighten the adapter just by hand. If it is, check your printer for under-extrusion and your fingers for signs of rust. Use dark filament to prevent unwanted reflections inside of the camera chamber.
CAD design document @Onshape.
Happy shooting!