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Non-rotating helical focuser with collet for Hadley telescopes

Free Non-rotating helical focuser with collet for Hadley telescopes 2023-10-16

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The Hadley telescope by Maff is a great design that allows makers for an easy and cheap introduction to astronomy.

There are lots of difficulties when using a telescope for the first time, for me one of them was trying to take a picture with my phone attached to the eyepiece through a mount. With the original focuser the eyepiece rotates when you adjust the focus, so it was necessary to adjust the quite often. Also, if the phone is not perfectly balanced in the eyepiece its weight can make it rotate.

This design tries to avoid this problem so it will be useful when using a phone/mount or an astro-camera.

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