Standard practice is to autofocus ONLY with L filter and then use measured filter offsets for all other filters (both board and narrowband).

But results depend A LOT on the composition of the image frame. There are some very difficult targets with few good stars in the frame, especially when imaging small fields in star-poor parts of the skies (ie, many galaxies).

It would be GREAT to have a simple option to specify a slew to a focus star as part of the autofocus system, tied to the scheduler so it's only triggered occasionally.

As long as we have reliable behavior in the "align" module, there's really no penalty for this hourly slew-and-return.

We can engineer this behavior by careful and tedious composition of sequences and schedules, but it's prone to error and logic gotchas.

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Scott Denning replied to the topic 'unguided dithering?' in the forum. 3 weeks ago

Thanks everybody!

Sometimes I think I'm blind or something, because I frequently miss fairly obvious GUI settings!

Scott

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Scott Denning created a new topic ' unguided dithering?' in the forum. 3 weeks ago

I frequently image without guiding, and would very much like to be able to dither anyway.

As far as I can see, this isn't possible in Ekos but it's certainly possible in other software.

The logic is as follows for sequences which specify dithering:

if guiding then
displace guide target coordinate
wait for guiding to move mount to new target
else
nudge mount or slew mount a very small distance

Oddly, I guess this belongs in the guider module, even though it's about unguided dithering.

Or maybe there are so few people doing unguided imaging that this is a silly request?

Thanks for considering.

Scott

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Hy,

I'll also endorse combining the guide controls into a single place (either on the guider tab or in Options -> Guider).

A couple of questions about these:

1) Proportional Gain and Integral Gain: What are the units? Is the left column RA and the right column DEC?
2) If I want a very light touch on RA, should I set one of these to about 1? Or about 10? Or about 0.001? I just don't have any sense of this.
3) What's the tradeoff between these two "Gain" settings and the Predictive and Control Gain in the Options -> Guider -> GPG RA Guider? Or are they unrelated?

Thanks!
Scott



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I'm having a lot of trouble guiding my Paramount MyT with the internal guider.

My results (rms, eccentricity) are substantially worse than unguided, so I suspect that I'm overcorrecting. My polar alignment is dead-on, and I can do 10-minute unguided exposures, but I hope to be able to tighten up the stars a bit.

I realize that Hy has recently implemented a bunch of wonderful new features, and I've been very successful guiding my iOptron CEM40. But I can't find documentation on some of the new parameters, which I want to adjust to make the guiding less aggressive. I'm especially interested in better understanding the following parameters:

Prediction Gain
Control Gain
Proportional Gain
Integral Gain

Are some of these in pixels and others in percentages (or fractions)? Does anybody have any idea of how far to back off these numbers if I just want a light touch of guide pulses every ten seconds or so to eliminate drift?

Screenshots attached.

Thank you!
Scott



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Trying out the Ekos internal guider on Paramount MyT with ASI290 and a FL=100 mm f/3 guide scope.

I've set the pulse to 5000 and waited 15 minutes or so while the guide star drifts just a few pixels (maybe 20 arc seconds). I suspect this is just polar misalignment, not responses to actual guide pulses. As I recall the ASCOM driver for Paramounts has a "Use Direct Guide" checkbox, and perhaps such a translation is required for INDI as well?

It's not trying to calibrate on a hot pixel. I have nice clear stars, and I'm using SEP Multistar, so the guider is measuring the guide star and the positions of a bunch of other stars as well.

The INDI mount driver is connected fine to TheSkyX and slews and tracks very well.

I've attached a log file showing the failed calibration along with screenshots of the settings and the resulting calibration plot.

Would love any advice you can offer!

Scott

File Attachment:

File Name: log_23-55-55.txt
File Size: 188 KB


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Since you asked for synonyms, here's how I name those same filters:

L, R, G, B, Ha, O3, S2

Thank you for your wonderful contributions to this project!

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