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INDI Library v1.8.6 Released (21 Aug 2020)

August 2020 release of INDI Library v1.8.6 introduces new drivers while providing fixes and improvements to existing devices and core framework.

New Internal Guider Features

2 months 3 weeks ago
alacant
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New Internal Guider Features #57624
PHD2's default is 12 iterations to give a 25 pixel move. The pulse length is determined according to guide speed and camera pixel size.

Would a pulse length calculation remove some of the confusion perhaps?

OTOH, I used EKOS' default of a pulse of 1000ms. It gave 3 pulses on each axis. I've reused this calibration 10 times without problems.

Cheers,
Steve

kubuntu 20.04
700d, eq6, t7m

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2 months 3 weeks ago
El Corazon
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New Internal Guider Features #57626

alacant wrote: PHD2's default is 12 iterations to give a 25 pixel move. The pulse length is determined according to guide speed and camera pixel size.

Would a pulse length calculation remove some of the confusion perhaps?

OTOH, I used EKOS' default of a pulse of 1000ms. It gave 3 pulses on each axis. I've reused this calibration 10 times without problems.

Cheers,
Steve


Steve, do you know whether PHD2 performs a regression analysis on those 12 iterations? Would it matter IYO? PHD2 seems so interminably slow to me, that was one reason why I ditched it as fast as I could. The internal guider always worked well enough for me, and especially now with Hy's PEC it shaved another few decimals off the RMS. PHD2 seems unnecessarily complicated to me.

Atlas Pro AZ-EQ, ASI1600MM-Pro, ASI120MM-S, ES102ED, WO-Z61, Nikon D3300, ASI-EFW, ZWO LRGB,Ha,O3,S2 filter set

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2 months 3 weeks ago 2 months 3 weeks ago by alacant.
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New Internal Guider Features #57627
Hi. Sorry, no idea about the regression but I too have now switched to Hy's new GPG pec and SEP multistar. That combination has taken my star fwhm consistently lower than PHD2 equivalents.

Probably best to look at the images themselves though rather than RMS.

Cheers and clear skies,
Steve

So much discussion. It must be full moon!

kubuntu 20.04
700d, eq6, t7m

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1 month 3 weeks ago
aliljenb
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New Internal Guider Features #59368

JCJ wrote: Hi Jo,
Good idea but both values are set to 133.3%
(I would not have dared changing these values !)
As suggested by Hy I set the iteration number to the max 10 and this improved a bit the calibration plot (see attached)

Hi, where do you set the proportional rate individually for RA/Dec?
Cheers,
// Åke

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1 month 3 weeks ago
wvreeven
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New Internal Guider Features #59370
To the lower right of the screenshot you see “Calibration Plot” and “Drift Plot”. There is one more tab to the left of that where you can enter those values.


HTH, Wouter

ASI6200 and filter wheel with a SkyWatcher Esprit 80 ED on a SkyWatcher HEQ5-Pro
ASI1600MM-Pro Cooled and filter wheel with an 8" TS Ritchey-Chrétien on a SkyWatcher EQ6-R
The following user(s) said Thank You aliljenb

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1 month 4 days ago
schwim
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New Internal Guider Features #60373
Hy,

I had my first nights using SEP Multistar this week on two different rigs. Fantastic work on this and the guide logs.

One one scope, SEP Multistar seems to "just work". The other not so much out the gate, though I will spend more time with it in the next days. Mainly, the system would not find a guide star. I posted another topic about this here:

https://www.indilib.org/forum/ekos/7772-multistar-guiding-doesn-t-find-star-to-guide-on.html

If Jasem is correct in the star shape being critical, this will make SEP Mulitstar difficult to use for ONAG implementations that have astigmatism as a feature.

You asked "what's next" and I have a few ideas:

- Auto-tuning of the PI controller
- Represent min/max values in arcsecs of movement based on discovered pulse dimensions that are seen in the options dialog for calibration.
- Auto-scaling of the min/max setting in cases where the calibrated values of ms/arcsec change. I've seen them change enough to think this might be a good idea. Maybe they shouldn't change and I need to chase a problem?
- Have proportional gain be a percentage of the ideal for a given mount's rate. For example, a mount that uses a rate of 0.5 == prop gain 133.3, so setting 100% uses that rate, 50% cuts it in half, 150% does the expected, etc.

Also, one thing that I've wished I've had way too many times is the actual guide log relative to a given exposure embedded in the fits header of subs for easy analysis. Eventually we could have a tool that allows you to open a sub and look at what happened with the guiding while it was exposing.

Thanks again for your hard work on this!

Greg

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1 month 4 days ago
hy
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New Internal Guider Features #60378
Thanks Greg.

One thing to note (re your last comment):

> we could have a tool that allows you to open a sub and look at what happened with the guiding while it was exposing.

Right now (if you are using experimental nightly releases or source-code) you can use the new Analyze tab
indilib.org/forum/general/7597-new-kstar....html?start=24#60055
to get an idea of the guiding during individual exposures, for the current or past KStars sessions.

Also, re astigmatism, I agree with Jasem that it's better to wait until the StellarSolver comes out before trying to improve
detections in distorted stars. A related issue is improving detections for defocused and doughnut-shaped stars, which
would also be quite useful.

Hy

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1 month 4 days ago
schwim
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New Internal Guider Features #60395
Yep, I'm on source builds so I see the Analyze tab. I hadn't had an opportunity to dig into it until just now, and it looks pretty useful. I like that it can show prior sessions, and open subs for inspection. Good stuff.

I'm standing by on StellarSolver. Can/will test it out when it's ready.

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1 month 3 days ago 1 month 3 days ago by maxthebuilder.
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New Internal Guider Features #60416
SEP Multistar is great! I am consistently getting rms <0.5 with my HEQ5 now. It used to be between 1 and 2 before.
Big thanks to Hy and everyone involved!

Max S.

RPI 4 B (4Gb) with SMate
Nikon D5500 H-a modified. Nikon D5500 stock
AT72EDII, TPO RC6
ZWO ASI294MC Pro, ASI071MC Pro
ZWO ASI120MC-S on ZWO 30F4
ZWO EAF x 2
SW AZ-GTi x 2
SW HEQ5

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1 month 3 days ago 1 month 3 days ago by Herrhausen.
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New Internal Guider Features #60431
I can only second that. Last weekend I came to use and test the new features for the first time. Slam dunk! They did work perfectly out of the box. Basically you select SEP Multistar guiding and you're done. Of particular interest to me is GPG RA guiding though. My G-11 suffers from a pronounced periodic error in RA and the new feature did work like a charm! After a few minutes I saw RA RMS results that were totally unheard of.



This is a tremendous improvement that removes the need (or wish) for any dedicated 3rd party guiding software altogether. IMO Ekos has taken several leaps forward in recent months. A wholehearted "Thank you!" to all contributors who made it possible and to Hy in particular!
Attachments:

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1 month 3 days ago
El Corazon
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New Internal Guider Features #60436
I totally second that. The GPG algorithm has made a lot of difference for me as well. And I am not even using an OAG, only a cheap ZWO 120 mm focal length guide scope with a CEM25P mount. I expect that work even better on my Orion Atlas mount using a 280 mm guide scope.

The internal guider for all practical purposes is now definitely on par with PHD2.

Atlas Pro AZ-EQ, ASI1600MM-Pro, ASI120MM-S, ES102ED, WO-Z61, Nikon D3300, ASI-EFW, ZWO LRGB,Ha,O3,S2 filter set

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1 month 3 days ago
hy
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New Internal Guider Features #60453
@schwim
Greg,

I showed your post to a couple friends who use ONAGs, and their opinion was that your guide image is likely out-of-focus.
The more out-of-focus it is, the more extreme the ellipticity on the stars. Could it be the case that you're guider is out-of-focus?

Apparently the ONAG has a helical focus adjustment on its guiding port, that you adjust after you get your main imager in focus,
with the goal of getting the two cameras parfocal.
They say you're supposed to adjust that to get the best possible star shape in the guide image.
If they are right, perhaps with that adjustment the current SEP star detection would work better.

Hy

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