Hello,
Recently bought used TS 6F4 and trying to start AP with it. My setup is ZWO AM3, TS 6F4, Sharpstar 0.95 CC, ASI 533MC Pro, Gemini EAF. On the first captured images i saw a tilt, ASTAP measured it in about 15-20%. I've moved camera and CC to my main scope (SW 130PDS) and checked - there is no tilt at all. So i think tilt is coming from TS telescope.
I've put some tape into TS focuser (like on SW), so CC does not move and sag. Also i add ZWO tilter to the camera and it helped - i can adjust tilt with it up to 3-5%.
But how can i find which part of TS telscope make this tilt? Maybe it can be fixed without tilter.
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andrea tasselli:
Focuser. Thanks. Do you mean that the focuser is not centered? It is not adjustable like SW focusers, so if yes, i have to use tilter and forget about it)
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99% sure the focuser. Really good focuser are rare and expansive. Usually the weakest part in the chain and often neglected by vendors.
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Hallo Maksim,
in my experience the tilt is caused by miscollimation, most often of the secondary mirror not being perpendicular to the main mirror. Are you absolutely sure that your telescope is well collimated? On my telescope, if i get i well collimated, the tilt disappears.
CS Haakon
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Haakon Rasmussen:
Hallo Maksim,
in my experience the tilt is caused by miscollimation, most often of the secondary mirror not being perpendicular to the main mirror. Are you absolutely sure that your telescope is well collimated? On my telescope, if i get i well collimated, the tilt disappears.
CS Haakon Thanks, i'm sure that it's collimated as well as possible, this is not my first experience with collimation)
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Tilt causes a change in focus across the field. If you posted a sample frame, people would be able to weigh in more.
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Maksim Selivanov:
Thanks. Do you mean that the focuser is not centered? It is not adjustable like SW focusers, so if yes, i have to use tilter and forget about it) *On mine there is silght tilt and the only way you can correct for it is by using a tilter. Tilt, not offset.
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Dark Matters Astrophotography:
Tilt causes a change in focus across the field. If you posted a sample frame, people would be able to weigh in more. Here are some examples captured without guiding in city center:before tilt adjustment  after tilt adjustment  Now i prepared this telescope for guiding and waiting for the weather to do more tests and do fine adjustment.
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Haakon Rasmussen:
Hallo Maksim,
in my experience the tilt is caused by miscollimation, most often of the secondary mirror not being perpendicular to the main mirror. Are you absolutely sure that your telescope is well collimated? On my telescope, if i get i well collimated, the tilt disappears.
CS Haakon You was absolutely right! I tried to think logically - what part of telescope forms light cone to focuser? Ofcourse it is the secondary mirror.. What if try to adjust it under the stars, not by chinese collimator? Yesturday i tried slightly move screws and see what happens with tilt in astap, and it works! Thank you very much, finally i can remove the tilter and see good stars in each corner. So if that laser collimator is enough for my 130PDS (F5), for F4 i need adjust secondary mirror much more carefully. Hope that will helps someone.  |
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Worth mentioning that laser colimators also require collimation
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You will need an autocollimator and cat's eye collimation method. You can use a laser only for the first approximation to center the secondary but then you forget about it and you collimate with cta's eye method and then with a star following Nawratil's guide: https://data.tommynawratil.com/Astro/pdf/Photonewton_Collimation_Primer_EN.pdfYour sensor is small so I do not think you will have much problems when the secondary will deviate with time.
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David Serquera:
You will need an autocollimator and cat's eye collimation method. You can use a laser only for the first approximation to center the secondary but then you forget about it and you collimate with cta's eye method and then with a star following Nawratil's guide: https://data.tommynawratil.com/Astro/pdf/Photonewton_Collimation_Primer_EN.pdf
Your sensor is small so I do not think you will have much problems when the secondary will deviate with time. As newbie i didn't hear about autocollimators yet. Read some information, it's seems to be that i need. But the price for cat's eye is the same as the price of my Photon 6F4) Will try to find one with good delivery price to my city. Maybe i'll find another AC with the same features.. Anyway, thank you!
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Maksim Selivanov:
David Serquera:
You will need an autocollimator and cat's eye collimation method. You can use a laser only for the first approximation to center the secondary but then you forget about it and you collimate with cta's eye method and then with a star following Nawratil's guide: https://data.tommynawratil.com/Astro/pdf/Photonewton_Collimation_Primer_EN.pdf
Your sensor is small so I do not think you will have much problems when the secondary will deviate with time.
As newbie i didn't hear about autocollimators yet. Read some information, it's seems to be that i need. But the price for cat's eye is the same as the price of my Photon 6F4) Will try to find one with good delivery price to my city. Maybe i'll find another AC with the same features..
Anyway, thank you! *** Hi, check the one of Farpoint Astro ***
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Hello Experts! Don't want to create another post and will ask new question here. After carefully adjustment and first tests i found another problem that i can't explain. On the fits image i see pretty round stars, but after initial stretch in ghs they looks like a small crosses. It happens only wigh middle-bright stars on the whole image, not in the corners. If i use bxt to reduce their size they looks like sharp crosses) I didn't see that before with another telescopes. What can it be - pinched optics, astigmatism or something else? Bright stars looks good.. fits.jpgpi_ghs.jpgpi_bxt.jpg |
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Hello. It is difficult to say. Looks like undersample but I think you have 1.36 arsec/px. What I would do is to drizzle 1x or 2x and see if there is an improvement.
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David Serquera:
Hello. It is difficult to say. Looks like undersample but I think you have 1.36 arsec/px. What I would do is to drizzle 1x or 2x and see if there is an improvement. Hi, thanks for that idea. I've compared two same stretched images - without drizzle and with 1x, and last looks a little bit better. So this pixel scale is not enough for good seeing, right? And solution for me is only with postprocessing by PI?  |
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I think your images are fine anyway. It depends on what do you want to show, if small stars or large nebula gradients or fine structures. I personally always try to do drizzle 2x to gain from deconvolution with BxT but that it is up to you.
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After all it was a pinched mirror. Here is crop of processed picture (without drizzle) after releasing the mirror clips - stars looks round and pretty good.  |
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This is a good example of understanding and applying the basics first.
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