Fotodiox T-EOS M Astro Edition to Baader UFC (Universal Filter Changer) Adapter

prusaprinters

The Canon EOS-M series digital cameras, especially the EOS M6 Mark II with it's mirrorless design and 32.5MP ASP-C sensor, is a great camera to get for astrophotography if your not looking for a dedicated astrophotography camera or full frame camera, which are many times more expensive.Fotodiox was the only company I found that made an adapter for the EOS-M camera line that allows it to connect to a T-2 camera thread common to most telescopes.  My issue was that I wanted to be able to put a filter between the telescope and camera and the only options available were for the Canon full frame cameras.So I ordered a ‘Fotodiox Lens Adapter Astro Edition - Compatible with T-Mount (T / T-2) Screw Mount Telescopes to Canon EOS M (EF-M) Mount Cameras for Astronomy’ and proceeded to take it apart and see how it was made.  I soon found that the EOS-M part of the adapter had a 50mm male dovetail part connected to it with set screws.  Basically the adapter was made up of two parts.I then took a look at the Baader UFC system and saw that the main camera side connection adapters had a 52mm female dovetail connector that mated with a 52mm male dovetail on the main UFC housing.So I did some engineering and found that I could create a part to replace the Fotodiox male dovetail with my own design that had the standard Baader UFC female dovetail and it would have the right optical length to make it work without issues just like a standard Baader UFC camera adapter.I designed the part in Fusion 360 and split it into two halves to optimize 3D printing and made a prototype.  You simply glue the two halves together and then tap the holes for six M3 set screws and put it all together.After a bit of trial and error I got the correct dimensions and I have been using the part with my camera and telescope ever since.  My original intention was to have the part machined in aluminum after I tested it with the prototype but it worked so well with the printed part I decided it was not necessary.