Parametric micro-focuser for astro- or macro-photography
thingiverse
The idea of this micro-focuser came from this thing: https://www.thingiverse.com/thing:1751383 I just wanted one for different lenses. It makes focusing a bit easier for astro-photography and for macro-photography. Also, for long astrophoto exposures with the lens pointing up, the focus of some lenses tend to change under their own weight This will keep the lens focused. The rings are held in place with M3 screws and nuts. The knobs on the screws make the rings a little easier to attach but you'll need to glue them. Or better, buy thumbscrews. The openscad file allows you to customise it to any lens. The model in the STL files fits a Canon EF 70-200mm f4.
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