Pentax-K to M42 adapter astro-camera
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Adapter to mount Pentax-K lens to an M42x0.75 threading of an astronomy camera
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This adapter is made to mount a pentax-K photographic lens to a M42x0.75 thread on an astronomy camera. It is made for camera with 12.5mm of back-focus (the distance between the front of the camera body and the sensor). The dot on the side is to be aligned with the red dot on the lens.
The adapter length is fixed so that we can focus slightly “beyond” infinity, i.e. the total backfocus is 45mm instead of the official 45.46mm for pentax-K mount. This ensure that infinity focus can be achieved even with some size deviation in the Z axis.
I tested it with my Player One Neptune 664C and a pentax-A 50mm, it should work with many other cameras using 12.5mm backfocus. If you plan on using a larger lens, do some testing beforehand and use it at your own risk, the extra weight might be too much for adapter teeth.
I used PLA, 0.4mm extrusion width and an adaptive layer height between 0.2 and 0.1 mm (the latter for the teeth and the M42 thread).