My astronomy project:
Riccardi field flattener and off-axis adapter

Content:

1. Overview wide field and planet configuration
2. Calculation of the optical system
3. First light test
4. Investigation of vignetting problem
5. Vignetting analyzes
6. Why do we get vignetting from the DSLR camera house?
7. Calculation of free opening to avoid vignetting
8. Modify of the adapters
9. Lathe and milling of the adapters * (You are here!)

9: Lathe and milling of the adapters

Here is the parts after the workshop has done the mechanic works on them.

Telescope side: This is the Riccardi adapter: Huge difference now, from 45 millimeter to 52 millimeter free opening.

Camera side: Black tape has been inserted at the blank area to reduce reflections.

The off-axis adapter. The free passage for the pickup prism was a bit to narrow. Seen from camera side how I have take away a part of the rim.

Close up of the entrance for to guide camera.

Seen from telescope side. With these screws I can now adjust both the tilt and length of the this adapter.

The screws that hold and adjust the distance.

There are three adjusting screw for the distance and three lock screws. Now it's easy to have the camera sensor and focus plane parallel and it's very stable too.

Adjusting to correct distance.

You see the stop screw and the lock screw here.

Camera side, the opening for pickup prism clearly seen, practical test show that this help a lot. Brighter stars in the guide camera and less vignetting from the prism / adapter.

Telescope side, a free passage to the field flattener.

Here how it look assembled and mounted on the field flattener.

Hole to insert the pickup prism.