Project:
Nikon D800 for astrophotography ?

Contents:

1. Nikon D800 overview
2. Adapter Nikon to Pentax 645
3. Lid, Dove tail, Tube ring
4. Focuser mechanism, driver
5. Off-axis guide camera
6. Main bracket
7. Wiring & USB-HUB
8. Test with Windows and APT
9. First Light
10. Balance system
11. Nikon vs Canon, Pentax FA vs Pentax
12. Tilt adjuster
13. KStars/INDI setup for Nikon
14. Correction of tilt
15. To be continued

Note:
I take no responsibility or liability for what are written here, you use the information on your own risk!

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• Setup astroserver with Raspberry Pi3
• Setup astroserver with Raspberry Pi4
• Setup astroserver with Raspberry Pi5

12: Tilt adjuster

My first test of the new astrophoto system show that I had a little tilt between the camera and lens. I expected that and I have already prepared my off-axis adapter to have a tilt adjuster built in. Just some small fixes (hours with the 3D-CAD program).

Added three bases with drilled holes for the tilt adjuster screws. I will use M3 screws, maybe a bit coarse, but can start with that. At the same time I developed the mounting of the guide camera.

The bayonet ring that attach to the Pentax 645 lens. Even here I have added three supports for the tilt adjuster screws. I have also developed the bayonet further, still missing a lock mechanism for the bayonet. One tricky thing is to get it in correct angle.

Earlier I glued these parts together but now they can be separated. The design is not finished yet, I plan to use shims between them which give the most stable solution. It will be hard to reach the screws without removing the lens.

To stop light leaking through the joint of the tilt adjuster I have added some pockets that stop this leakage.

The Pentax bayonet ring has corresponding walls that fit the pockets.

Almost there to 3D-ptint it. It takes 10 hours in o.1 mm resolution mode so best to check carefully.