A simple secondary mirror holder for a diagonal mirror with a minor axis of 4 cm or more.
I designed this secondary mirror holder for my dobson telescope building project using a 203 mm diameter primary mirror and a secondary mirror with 70 mm of minor axis.
This simple diagonal mirror holder has the basic 3 screws at 120 degrees to tune the tilt of the secondary mirror. Rotation and translation back and forward the telescope tube is achieved thanks to the M4 screw.
It is a simple but efficient design.
Update 26/08/2019
I finally ended up painting the mirror mount flat black and I also did a small knob to easily tune the distance back and forward the telescope.
Updated the photos with the painted mount, nicer to look at the finished one!
I added the base part designed for M5 spider vanes for those who prefer a more robust spider vane even if it is not that necessary.
Parts needed
| Knob_v3.stl | 58.6KB | |
| Mirror_Holder_v3.stl | 47.7KB | |
| Vane_part_m4_spider_v5.stl | 135.5KB | |
| Vane_part_m5_spider_v8.stl | 134.9KB |
