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!

Related projects:

• KStars / Setup GPS Raspberry
• KStars / Setup WIFI Hotspot Raspberry
• KStars / Linux commands and udev rules
• KStars / Raspberry Power
• Setup astroserver with Raspberry Pi3
• Setup astroserver with Raspberry Pi4
• Setup astroserver with Raspberry Pi5

14: Correction of tilt

The photos I have taken with the new camera and optical system show indications of some problems. One of them is that there is a left<>right tilt of the sensor.

Visual analyze of the tilt:

Compare the left and right and you clearly see that the left stars are out of focus. Maybe the focus plan differ +/- 50 my from the ideal left<>right. The later analyz will tell that.

Tilt adjuster:

With the new tilt adjuster I built into the off-axis adapter it should be possible to correct this tilt. The tilt adjuster screws sit about twice the sensor size apart. M3 screws has a pitch of 0.5 mm, one revolve of the screw moves that distance. 0.5 mm moves the long side of the sensor about 285 my. A little bit to much, 1/10 of a revolution moves the sensor 28 my. Maybe I can replace the screws with some ones with a finer pitch. But I can test it as it is now.

Computer analyze of the tilt:

In the new version of the control software I use, KStars/Ekos in 64-bit there is a new tool. The Aberration inspector. That will make it a lot easier to correct the tilt.

Aberration Inspector:

• https://www.astroworldcreations.com/ ... kstars-368-aberration-inspector ...
(Aberration inspector)

Come back later.