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Old 23-05-2022, 04:10 AM
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pkinchington (Peter (Kanga))
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Southern Pinwheel Galaxy

Managed to squeeze in some 14x2min subs in average seeing conditions last night - before the clouds rolled in. Need to get a handle on the star shapes. Can't seem to correct stars even with GSO coma corrector at "correct" spacing on 200mm f/5 newtonian.
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Last edited by pkinchington; 23-05-2022 at 04:23 AM.
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Old 23-05-2022, 05:18 PM
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PKay (Peter)
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Go for it Kanga, that's a rad Pinwheel!

Keep going
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Old 24-05-2022, 12:55 PM
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pkinchington (Peter (Kanga))
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Go for it Kanga, that's a rad Pinwheel!

Keep going

Thankyou Peter
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Old 24-05-2022, 02:56 PM
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Originally Posted by pkinchington View Post
Managed to squeeze in some 14x2min subs in average seeing conditions last night - before the clouds rolled in. Need to get a handle on the star shapes. Can't seem to correct stars even with GSO coma corrector at "correct" spacing on 200mm f/5 newtonian.
Good on you for getting out there. Nice Image

On the issue of the coma/star shapes: looking at the bottom LH corner things look considerably better, suggesting that there may be some tilt in the mix to contend with, which once dealt with may improve other areas. Perhaps look at how the image train/nose piece potentially moves as you clamp up the camera - that may provide a clue as to possible movement and hence source of tilt if present. Also if you are not already doing so, consider using a UV/IR filter to cut the IR response of your fully modified(??) FF camera so that you still capture Hydrogen Alpha, but don't introduce any potential star bloat by capturing any light in the near infra red. (I'm not saying that's happening, but who knows without testing)

Best
JA
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Old 05-06-2022, 04:47 PM
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pkinchington (Peter (Kanga))
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Quote:
Originally Posted by JA View Post
Good on you for getting out there. Nice Image

On the issue of the coma/star shapes: looking at the bottom LH corner things look considerably better, suggesting that there may be some tilt in the mix to contend with, which once dealt with may improve other areas. Perhaps look at how the image train/nose piece potentially moves as you clamp up the camera - that may provide a clue as to possible movement and hence source of tilt if present. Also if you are not already doing so, consider using a UV/IR filter to cut the IR response of your fully modified(??) FF camera so that you still capture Hydrogen Alpha, but don't introduce any potential star bloat by capturing any light in the near infra red. (I'm not saying that's happening, but who knows without testing)

Best
JA
Hi JA,
I will check all these things. The camera connection may have had some movement.
Cheers Kanga
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