80mm Refractor Telescope

prusaprinters

<p>This an 80mm objective diameter, 330mm focal length refractor telescope. It is a work in progress, but it should be functional as-is with some fuss and fitting. each section is small enough to be printed on a Prusa Mini. It uses this <a href="https://www.printables.com/model/125438-125-crayford-focuser-for-telescopes">1.25" crawford focuser</a> and <a href="https://www.ebay.com/itm/174944461860">a cheap lens</a> off I got off ebay. Additionally a 1.25" diagonal and eyepieces are required to make this functional.</p><p>The lens is 82mm is diameter and I measured its focal length at 316mm. I do get some chromatic aberrations as is typical with lens of this type. Overall this is a cheap and relatively fast scope with reasonable image quality.</p><p>So far I have only printed this in PLA, and I will report back if I have any issues. A variety of M3 and M4 screws and threaded inserts are also required for assembly. Additionally one ¼ 20 threaded insert is required for the tripod mount. Four springs are needed for the lens cap.</p><p>&nbsp;</p><p>Update 7/19/2022: so far the PLA has held up fine. It survived a week RV trip being bounced around on dirt roads. Optically there is some chromatic aberration, but it seems fine for visual observation.</p><p>&nbsp;</p><p>Update 9/1/2022: Still no issues with the PLA. I have updated the scope rings, handle, and mounting piece. The new design is lower profile and a bit more refined.</p>