1.25" threaded filter Bahtinov Mask for DWARF II (Dwarf 2)

thingiverse

A 1.25" screw in "lens" (M28.5 x 0.6 threads) Bahtinov focusing mask / grate specifically designed for the DWARF II telescope (but should work in anything else that takes a 1.25" lens. To use, you point your scope at a bright star such as Siris, attach the mask/grate, and then examine the diffraction spike pattern. Use the Focus [+] and [-] buttons to center the straight between the "X" lines. https://en.wikipedia.org/wiki/Bahtinov_mask I designed this for a Resin or other high definition printing technology to create the threads and narrow slots. However, people have reported successful prints with FDM printers at the "fine" setting (but I'd suggest you look at the FDM specific models linked below). If you don't have a Resin printer, I sell them on ebay as well: https://www.ebay.com/itm/155526611320 If you have an FDM printer, there exist other options that are more suitable for FDM printing. I have tried and recommend: https://www.thingiverse.com/thing:5900843 which is the gray filter on the right in my resin vs fdm comparison image. *WARNING* There is a batch of Dwarf Lab Dwarf2 magnetic snap on filter holders that are out-of-spec (their thread size is too large). So if this filter does not fit your DWARF LAB filter holder....check it in a regular telescope eyepiece, or try another filter as well before you try and adjust your printer settings. See this video for examples of the correct sized vs the too large size: https://www.youtube.com/watch?v=bFfrb4SaE7g