Astro-Tech AT102ED Telescope

It’s a nice, relatively cheap refracting telescope.

Making the Bahtinov Mask

The outer diameter of the leading element is 122mm.

I have a bahtinov mask available here, it was generated from this svg, which itself was generated from this page. The relevant specs for that is it’s 102mm diameter lens, and it’s 714mm focal length.

This is also available on thingiverse


With a Canon EOS 6D on a T-ring (1.25 inch), this focuses at just past 41mm.

With a Canon EOS 6D on a 2-inch T-Ring, this focuses at about 82.5mm.

Last updated: 2020-12-22 16:44:36 -0800