I`m starting this topic, as a DIY On-Axis Guider, inspired from Poor Man's On-Axis Guider.
But I have decided to step a little bit further and change the essence of the usage of a Cold Mirror substrat with a Hot Mirror one. The difference is that the cold mirror reflects the visible light, and passes the infrared, but Cold Mirror is totally opposite. It reflects the IR and passes visible. I simply didn't like the idea, the main imaging camera to use the reflected light and to be located 90 degrees from the main beam. I have searched the internet and found one excellent Hot mirror substat, from a UK based producer. Quickly made a purchase for a 50mmx50mm sample and started the design phase. 50x50, allows full-frame cameras to be used and the light-path (from adapter to adapter is minimal (56,8mm)
I have a nice 3D printer and some “Autodesk” skills, so I have ended up with the design on the attached pictures. I also decided to use Starlight Xpress standard adapters for the telescope and camera side and a standard T-2 thread for the guider. I also tried to keep the plates as thin as it can, to manage the lightpath short. Printed the 3 parts, assembled the set and...here what I have smile.gif
Now I have to wait for some clear skies, to give it a real live test.
I count on your comments behind the fact that I`m just a “small” (around 100kg) astro-amateur from Bulgaria and I was inspired only from pure DIY without any commercial intentions
N.B
The blue color of the mirror is because there is a removable protective coating, that will be removed before initial usage.
The glass is completely transparent as seen on the diagram bellow.