Sensor tilt or focuser tilt? Please help :) Generic equipment discussions · Krzysztof Gaudy · ... · 9 · 293 · 4

gaudyk 2.81
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I've perfectly adjusted the tilt on my astrophotography setup, which consists of an Esprit 120 telescope, a Riccardi 0.75x reducer, and an ASI 2600MM Pro camera with a 2" filter wheel.

perfect_tilt.png


However, I've noticed an issue when rotating the camera within the focuser -whether manually or using the Deep Sky Dad motorized rotator. Depending on the rotation angle, the tilt measurement changes noticeably. Although the tilt remains within acceptable limits for this setup, the issue becomes visible through distorted star shapes, particularly in the right corner.

mech_position_329_tilt.pngmech_position_270_tilt.png
Importantly, I verified that tilt measurements at a specific camera angle remain nearly consistent across different areas of the sky. Therefore, the variation in tilt seems directly linked to the rotation angle? 

My setup: telescope, tilter, reducer, rotator, filter wheel, camera. 
setuop.png

Could someone please help me understand the source of these tilt variations, especially considering the use of a mechanical rotator? Any insights or explanations would be greatly appreciated
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iosifbodnariu 0.90
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Try only Camera and scope.

And add tilt, rotator, and filter well, one by one, and you will find.

This app to measure tilt where can be find.

Thankyou
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StewartWilliam 5.21
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Get one of these and you will know for sure where the tilt is coming from, and if it’s the imaging train it’s very easy to sort in a few mins indoors, during the day in the warm, if it’s the focuser, then at least you know, and then can sort..👍🏻

https://youtu.be/iyH7vsAqcDA?si=-vmTMi08_7YzeRQK
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andreatax 9.89
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It's the rotator. Less is more.
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Gondola 8.11
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I wonder if putting the rotator behind the filter wheel might help, a bit less weight for it to deal with?
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Krizan 5.94
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I found that a Pegasus Falcon v1 increased my tilt on a FSQ106ED from 4-6% to 40% when rotated 180 degrees. I have a Pehasus Falcon v2 , but have not tested it.  I would suggest, as proposed in preveious post, to first test camera tilt in the most orthogonal set up you have. Do not worry about coma, because all corners shpould have equal coma in the stars in a flat chip.  Trying to matain correct back focus from a flattener or reducer in chip corrers while correcting chip tilt is near impossible.

Lynn K.
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CraigT82 1.20
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AstroShed:
Get one of these and you will know for sure where the tilt is coming from, and if it’s the imaging train it’s very easy to sort in a few mins indoors, during the day in the warm, if it’s the focuser, then at least you know no can sort..👍🏻

https://youtu.be/iyH7vsAqcDA?si=-vmTMi08_7YzeRQK

Really nice piece of kit that is
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StewartWilliam 5.21
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AstroShed:
Get one of these and you will know for sure where the tilt is coming from, and if it’s the imaging train it’s very easy to sort in a few mins indoors, during the day in the warm, if it’s the focuser, then at least you know no can sort..👍🏻

https://youtu.be/iyH7vsAqcDA?si=-vmTMi08_7YzeRQK

Really nice piece of kit that is

TBH, I think it’s a game changing piece of kit, at least it was for me, as tilt was tha bain of my Astro hobby
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kilroi22 0.00
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AstroShed:
Get one of these and you will know for sure where the tilt is coming from, and if it’s the imaging train it’s very easy to sort in a few mins indoors, during the day in the warm, if it’s the focuser, then at least you know, and then can sort..👍🏻

https://youtu.be/iyH7vsAqcDA?si=-vmTMi08_7YzeRQK

The April Sky and Telescope has an article on page 62 by Chris Schur describing in detail how to make a laser camera tilt tester.
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StewartWilliam 5.21
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Dan Burns:
AstroShed:
Get one of these and you will know for sure where the tilt is coming from, and if it’s the imaging train it’s very easy to sort in a few mins indoors, during the day in the warm, if it’s the focuser, then at least you know, and then can sort..👍🏻

https://youtu.be/iyH7vsAqcDA?si=-vmTMi08_7YzeRQK

The April Sky and Telescope has an article on page 62 by Chris Schur describing in detail how to make a laser camera tilt tester.

Yes I built my own to start with, and was fun also worked pretty well, here is a video of my build.

https://youtu.be/Gw2oTwb4GjY?si=6CJ9qnre6DGrzW7V
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