Check one of the boxes on the bottom right area... "Repeat for X Runs" or "Repeat until Terminated".

Ron

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Hy,

This looks very promising! Looking forward to trying the new method.

Thanks!

Ron

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Ron Clanton replied to the topic 'New Focus Algorithm in Ekos' in the forum. 3 weeks ago

Peter,

Thanks for the explanations!

Good to hear on the backlash... as you say, it shouldn't really matter with linear.

On focus with a SCT... I can understand the difficulty with the focusing mechanism. For me, it's all the more reason to keep it simple. First form a good curve on the first pass, then move out a large amount and back to that position.

On the polling time... This may be where I'm having issues. Mine is set at 1,000 ms (1 sec). Based on what I hear when it moves out and then moves in, it is nowhere near a 1 second delay. I'll need to check the messaging to see if it reports reaching the position. Next time, I'll try an exaggerated polling time (like 3,000) to see if I can discern a true delay.

Thanks again!

Ron

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Ron Clanton replied to the topic 'New Focus Algorithm in Ekos' in the forum. 3 weeks ago


I could be wrong, but I thought that the backlash number is not used in the linear process. That is why it moves a large amount outward and then moves inward to eliminate backlash.

However, as I've written before, I'm not sure that the "outward/inward" move is effectively removing the backlash in my setup. I don't know how to prove it, but when EKOS sends the outward command it immediately sends an inward command. Based on simple observation, it feels like the focuser hasn't completed the outward move before receiving (and moving) inward. Therefore, the focuser is not at the expected position when it starts the second pass. Just my humble opinion. I wish there was just a brief pause between commands.

I also would really like to see a single pass process. The second pass never improves my focus point and often confuses the process, causing a redo.

Ron

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Ron Clanton replied to the topic 'New Focus Algorithm in Ekos' in the forum. 2 months ago

Thanks John. Yes, there is also a polling period setting in the Celestron focuser and it is set at 500ms. However, as I listen to the focuser move it is clearly not pausing between the move out and move in. Looks like I need to submit a ticket to Jasem!

Thanks!

Ron

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Outta,

This feature/switch is missing from EKOS. I also would like to see this feature, as I have pretty good tracking without guiding.

You need to use Scheduling, as it has a mechanism that will restart the job if aborted. It's not perfect... doesn't work in some situation, but is better than nothing.

Ron

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Ron Clanton replied to the topic 'New Focus Algorithm in Ekos' in the forum. 2 months ago

John,

I only use the Celestron focuser with the linear method of my Celestron 8HD Edge. I'm not sure that I would describe it as an issue with the mechanics... the current process just doesn't give the focuser time to complete the "out" movement before it issues an "in" command. It may be working fine and I'm simply experiencing what Doug is describing. However, when I'm sitting at the scope it sounds like it starts reversing before it finishes the out movement.

This is one of those situations where I would think it wouldn't hurt to have a very short (1 sec) pause between commands.

BTW... I'm not fond of the Celestron focuser. I sometimes experience connection issues with INDI... seems unstable. I've ordered an ZWO EAF to replace it on the 8HD Edge, but have been waiting several weeks for the back order to clear.

The ZWO EAF on my refractor works perfectly with the polynomial process.

Thanks for your effort!

Ron

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Ron Clanton replied to the topic 'New Focus Algorithm in Ekos' in the forum. 2 months ago

Doug,

Thanks for the thoughts. I have read this article and find it interesting. I guess that I have used "trial and error" for my different scopes and focusers.

Like others, I find that the "one pass" does a pretty good job at finding the best focus. The second pass process, while theoretically valuable, does little to improve the focus. In fact, it usually was the cause of creating an error, aborting and restarting the process.

I'm looking forward to using John's new process!

Ron

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Ron Clanton replied to the topic 'New Focus Algorithm in Ekos' in the forum. 2 months ago


John,

Thank you. I understand the process... but in my case, when it does the "backlash hokey-cokey" it moves out then in so quickly, that I don't think the focuser has reached the full "out" setting. I think it would benefit from a move out, pause 1 second, move in... to assure that it getting the full effect.

Thanks,

Ron

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Ron Clanton replied to the topic 'Focus after flip?' in the forum. 2 months ago

Thanks! Will it be included in the next update?

Ron

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Ron Clanton created a new topic ' Focus after flip?' in the forum. 2 months ago

Over the last couple of nights, I just noticed something. I have my scheduler check boxes set to automatically track, focus, align, and guide. It does all of this correctly at the start of the job. However, I just noticed that it doesn't perform the focus at the meridian flip. It performs the track, align and guiding just fine. I'm wondering if others have this issue? It's a problem for me due to the mirror flop on my SCT... the images are usually not in good focus after the flip. I have periodic focusing setup in the capture tab, so it eventually focuses... but I lose several frames until then.

Any ideas?

Ron

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Ron Clanton replied to the topic 'New Focus Algorithm in Ekos' in the forum. 2 months ago

Agreed. Seems that the first pass calculation is really good... then it should move way out (to eliminate backlash) and then back to that point.

One additional thing that seems to happen to me... When it currently moves way out, then in, it doesn't wait for the focuser to hit that "out" position. Which means it doesn't always eliminate the backlash. Perhaps you could put a small pause after it moves out... before it moves back in?

Does that make sense?

Ron

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Ron,

Yeah, I may have to revert to your method. I had high hopes for the alignment check, but either it's not working... or I'm doing it wrong.

Ron

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Chris,

I tried your tip tonight... and it didn't work. I see no indication of it checking alignment. Are you sure that there is no other setting and/or check box that needs addressing to make this work?

Thanks,

Ron

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