Soren replied to the topic 'Off-Centered After Flip' in the forum. 5 days ago

Maybe the developers should considering enabling logging of everything pr. default, such that logs can always be provided?

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Soren replied to the topic 'Meridian Flip Configuration' in the forum. 7 days ago

I actually can not remember, so I can neither confirm nor deny that statement :-)

I'm at summer time now, so the season may be close to over here and I'm not sure I will be able to test it further. But i has happened many times and with different version of kstars/indi. I have been using the development version the last few months, if that matters....

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Soren replied to the topic 'Meridian Flip Configuration' in the forum. 7 days ago

Not sure it is the same issue, but I have experienced many times that when I click go-to I kstars, the mount goes somewhere else (often close by) and the pointer in kstars does not end up where I clicked. After clicking go-to again the mount either moves almost nowhere as it is already there (but infact somewhere else close by) or it goes to the correct taget. Seems like kstars and Indi are not completely synced or something. Since it eventually works correctly after a few tries, I currently have no debug logs to post.

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Eric thanked Soren in topic For those with focus issues 2 weeks ago

Soren replied to the topic 'For those with focus issues' in the forum. 2 weeks ago

hy wrote: I get many more stars with my f/5.6 scope on a typical image.
For an R,G, or B filter I use 3s exposure, gain 200 in the focuser (ASI1600 camera) and on most of my attempts was getting ~70 stars.
For Ha/SII/OIII I use 5s and get a similar number of stars.
Also, fwiw, I use a binning of 2x2 on my focus images.

If you aren't getting lots of stars, can you try adjusting your focus exposure and see if that improves things?


The galaxy image shown above is ~40 minutes of exposure and does not show that many stars in the field. Downscale the exposure to 1-10s and you only get a handful of stars showing up. The focal length is 1320 mm and chip is ICX285AL, so FOV is 0.39 deg. x 0.29 deg, which limits the number of stars in the field.
I'll try 2x2 binning to see if it helps.

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Soren replied to the topic 'For those with focus issues' in the forum. 2 weeks ago

hy wrote: I agree with the above comments, which is why I strongly recommend you use the "Full Field" focus setting (in focus tab, under settings sub-tab).
Use it with an Annulus of like 25% 80%. Doing this and it will detect many stars, throw away outliers, and then average the results. This is much more stable.
I recommend the SEP star detection algorithm also.


Not all field show "many stars" when doing this, one example is the image of the two galaxies I posted above. Maybe 3-8 stars are found with a 5s exposure and if one of them is not really a star it seems to throw the focus way off course. A more stable star-locator seems to be needed. Since it is generally assumed that one starts all the focus algorithms pretty close to focus, the star-locator could maybe be told to only look for stars in the same places as it located stars in the first image? It seems to me that sometimes new stars or non-stars are located and possibly throw the focus algorithms way off course. And if it gets way out of focus, it may even not detect any stars. It should be the case that the stars do not move notably between focus images and their HDR value should only change a bit. They may be some useful information to the star locator algorithm.
Well, that's my experience anyway and I could of course be doing something wrong or crazy :lol:

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Soren replied to the topic 'For those with focus issues' in the forum. 2 weeks ago

To comfort you, I can say that I see the same kind of error all the time. And with any of the star detection algorithms. Other noon-star features are also sometimes picked up, like edges of dust mites, ccd defects and so on. Also sometimes extremely large features are find (most stars hfd 1.5 and then one with hfd 50). Maybe, when using full field, ekos should throw away outliers, i.e. extremely large and extremely small 'stars' when compared to the mean size of all stars?

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Soren replied to the topic 'For those with focus issues' in the forum. 2 weeks ago

Thanks for the reply.

The (1) dot is what I would call close to focus. HFR ~1.7 and "perfect" focus may be like 1.3-ish.

There is no backlash compensation in FCUSB, as far as I know, do it should be off.

There is a "reverse direction" switch in the FCUSB tab. Could that mess with the algorithm? (maybe the motor is always turning the wrong way?)

The more stars the better in the image, when using full field?

I'll try again and report back. Thanks for making this happen in the first place :-)

I have attached an image of NGC 3793 and its friend, to show that it is not "all work and no play". I feel that everything is continuously improving at the moment :-)



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Soren replied to the topic 'ZWO EAF' in the forum. 2 weeks ago

Could a simple model, like a fixed focus-shift pr. temperature, also work, such that one does not need a full refocus but just some minor (semi-continuous) adjustments based on the temperature difference alone? Just a crazy idea...

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Soren replied to the topic 'For those with focus issues' in the forum. 2 weeks ago

Hi!

I still can't get autofocus to work reliably. After fixing some mechanical and optical problems it is much better than before, but only works in say 50% of the time and this applies to all algorithms. In 100% of the time I can focus manually using the in and out buttons. Here is an example where the linear algorithm gave an error:


The algorithm continued to move the focuser the wrong way until it was so out of focus and could not detect any stars and gave an error.

Here are some other things that seems to mess with all the algorithms:

1. The HFR values calculated are very noisy in general, and I imagine it can be hard to focus with noisy values. I use 'auto star' and 'full field'. Maybe one should be able to choose also the minimum or maximum HFR instead of the average?

2. The star locater is sometimes locating non-stars, which messes up the HFR value. This can be e.g. hot pixels, edges of dust motes, edges of the CCD (my CCD for some reason give a black border around the whole image). I have tried all star detection algorithm and can't seem to get reliable results.

3. If image is far from focus, the star detection detects sometimes the edges of the donut-star-image produced by a Newtonian telescope and most often it does not detect the donut-start-images.

I have now ordered a ZWO EAF, which I hope will improve upon my FCUSB+DC AccuFocus motor, but all helps is appreciated since I imagine the EAF might not solve all problems for me...

Best Regards,
Søren

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Soren replied to the topic 'ZWO EAF' in the forum. 2 weeks ago

Thanks a lot, I have one on order now :-)

It's it ekos or the driver that does not support the temperature sensor?

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Soren created a new topic ' ZWO EAF' in the forum. 2 weeks ago

Hi!

Anyone using the ZEO EAF with indi/ekos for autofocus? Does it work and can you get autofocus to work consistently, also between filter change, temperature change and so on? (the EAF has a temperature sensor, does that function?)

Considering getting one very soon, just want to be sure it works....

Best Regards,
Søren

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Soren replied to the topic 'Current Selection Wisdom on INDI Focuser Software?' in the forum. 2 weeks ago

Ok, thanks. I was hoping one could just get the motor and hook it up to Indi Those controllers are crazy expensive....

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Soren replied to the topic 'Current Selection Wisdom on INDI Focuser Software?' in the forum. 2 weeks ago

Sorry to butt-in but, it seems there are some Moonlite users in this thread... What exactly have you bought from Moonlite to get autofocus working with indi? Just the motor or also one of their controllers? Does the motor replace the fine-focus knob? (I have a an old CR2 with fine-focus knob, but the fine focus knob seems to be broken....)

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Soren replied to the topic 'For those with focus issues' in the forum. 3 weeks ago

Finally some nice weather and I was able to test the new algorithm. I turns out that I also previously has a problem with my coma corrector so I have now switched to another one. This did wonders on the focusing and my curves are no longer very flat near the bottom but actually looks more V-shaped. After fixing this issue, all algorithms in EKOS actually seems to work OK, including Linear. I also identified that I might have some kind of slip in my focusing system, so next step is to fix this and hopefully focusing will be very reliable. So in total, it seems that most of my problems with focusing was related to both optics and mechanics. I look forward to trying out the linear algorithm more when I fix my remaining mechanical issues.

As I general note, it seems to me that indi/ekos/kstars have become much more stable during the last year. Great work to all the coders out there :-)

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