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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.

Riccardi adapter

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

Riccardi adapter

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

Off-axis adapter

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.

Off-axis adapter

Close up of the entrance for to guide camera.

Riccardi and off-axis adapter

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

Riccardi and off-axis adapter

The screws that hold and adjust the distance.

Adjusting lenght of adapters

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 lenght of adapters

Adjusting to correct distance.

Adjusting lenght of adapters

You see the stop screw and the lock screw here.

Passage for pickup prism

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.

Passage for pickup prism

Telescope side, a free passage to the field flattener.

Assembled

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

Assembled

Hole to insert the pickup prism.

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