Magnus Larsson created a new topic ' Focuser subfram missing the star' in the forum. 7 days ago

Hi!

New problem with focuser: It selects a star, then captures again but the subframe does not contain the star.
I switch to not autmatically seleceting a star. So: first capture of full frame, then I select a star, click firmly on it, then new capture of subframe. The subframe does not contain the star.

There seems to be something strange with the geometry here. Log attached. THis behavior is just at the end of the log file.

Magnus

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Magnus Larsson replied to the topic 'Location of device profiles?' in the forum. 1 week ago

Hi!

Yes, I'm using new cards, but they seem to become corrupted quite quickly, that's the problem. I wonder if I'm doing something bad to them...

And yes, I'd be happy to try! :)

Magnus

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Magnus Larsson replied to the topic 'Location of device profiles?' in the forum. 1 week ago

Obviously. I was going through the menus and the Stellarmate website... and there it was, right before my eyes.
Thanks!

While being at this - these quite frequent faillures, where the R-Pi goes into panic mode - any ide what causes that? And my SD cards seems to fail, so that I cannot write a new disk image on them (that is, Disc utility in Ubuntu reports IO-failure when trying to restore a disk image).

Magnus

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Magnus Larsson replied to the topic 'Location of device profiles?' in the forum. 1 week ago

Ah. Where to I find this tool?

Magnus

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Magnus Larsson created a new topic ' Location of device profiles?' in the forum. 2 weeks ago

Hi!

Where are the device profiles and Ekos profiles that I set up, stored? I'm doing backups of my Stellarmate (my SD-cards frequently fails...) and thought I should preserve these separately so as to facilitate new re-installations on new SD-cards.

So: where do I find them on the Stellarmate?

Magnus

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Hi!

I've seen this error before, but it was some time ago:

THe focuser aborts, saying max travel reached. However, I had max travel at 500 and it moved from 1435 to 1200. So what is this with max travel?
Log file attached (I hope the data is there).

Magnus

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Magnus Larsson replied to the topic 'Focusing challenge: handling SCT "doughnuts"?' in the forum. 4 weeks ago

Hi!

Hrm. Interesting. I use centroid algoritm and that mis-identified the biggest ones here.

Yes, I'll send log next time. How much would you recommend max travel to be set to?

Best,

Magnus

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Magnus Larsson replied to the topic 'Focusing challenge: handling SCT "doughnuts"?' in the forum. 4 weeks ago

Hi!

Here is a bunch of fits subframes, gradually moving from focus to doughnuts. Useful? Number in file name is focuser position.

Magnus

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Magnus Larsson replied to the topic 'Focusing challenge: handling SCT "doughnuts"?' in the forum. 4 weeks ago

Hi!

I can easily produce fits-images of doughnuts. You mean from focuser, that is, short exposures, and at varying focuser positions, so the doughnut grows bigger and bigger? I can do that next time the clouds part...

Magnus

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Magnus Larsson replied to the topic 'Focusing challenge: handling SCT "doughnuts"?' in the forum. 1 month ago

Hi!
No, I haven't yet tried other algoritms, as this is quite unpredictable, that is, I cannot force it to happen, and the polynominal seems to generally give me fastest and best results. I do also believe that the issue here is more that the focus mechanism does not recognize the doughnut as a doughnut... in that case, it would be as with your and find its way back - at least that is my thinking for the moment.

Magnus

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Magnus Larsson created a new topic ' Focusing challenge: handling SCT "doughnuts"?' in the forum. 1 month ago

Hi!

I have repeatedly run into a focusing challenge with my C8: in the midst of a sequence, for some reason the focuser moves a certain distance away from focus, and settles on a doughnut pattern. This then stays there for several focusing sessions, and some (random) time later the scope returns to correct focus. So it is not just one, but 2-4 focusing attempts that settles on a doughnut - and then suddenly, not - back to pinpoint stars.

I really have no idea why the focuser moves from pinpoint stars to doughnuts in the first place - but it could be due to passing clouds or other intermittent stuff. However, the focus routine seems to accept the doughnuts more than I like. So my questions: are there strategies for handling this? TO minimize the risk that the focuser does not recognize the doughnut as a doughnut, settling for that as focus? Larger box size, more aggressive settings somewhere, or different algoritm? Or full field?

I'm using a DSLR: Canon 1000D. I've been experimenting with using darks in the focus routine, but it seems that it actually is MORE reliable without darks (easier identification of stars). Scope is C8 with reducer F 6.3.

Focuser module settings in attached screenshot.

Grateful for any advice.

Magnus



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