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INDI Library v1.8.5 Released (19 Apr 2020)

April 2020 release of INDI Library v1.8.5 introduces new drivers while providing fixes and improvements to existing devices and core framework.

Dithering question when using Phd2 and Ekos

9 months 1 week ago
jerry
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Dithering question when using Phd2 and Ekos #43885
This is a dumb question, as I of course could just try it and experiment, but I'm about to try Dithering for the 1st time...

Both Ekos and Phd2 seem to allow the enabling of dithering. If I configure Ekos to use Phd2 guiding do I also enable Dithering in Ekos or does Phd2 handle all of that?

Also trying a new ZWO ASI224MC as the guide camera rather than my QHY5IllM. Phd2 will directly connect to the ZWO, while (for me) it would only connect to the QHY via indi. This will get closer to matching rlancaste's suggested setup. :)

Thanks.

120 MM Skywatcher Esprit on Celestron CGEM DX HC: GEM 5.29.7137 MC: 6.50 6.50,
ZWO ASI 224MC or QHY-5L-II-M for guiding,
Nikon Z7 8256 x 5504, 35.9 x 23.9mm 4.34 um pixel size.
1) StellarMate on RPI4
2) Kstars on Odroid-N2 on Ubuntu-mate 20.04 and
3) KStars on Astroberry on RPI3.

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9 months 6 days ago
DerPit
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Dithering question when using Phd2 and Ekos #43929
PHD2 doesn't dither by itself, as it knows nothing about ongoing exposures. It's always EKOS that triggers a dither (between exposures). For configuring it, look at the 'Options' in the Guide tab of EKOS, as well as in the Capture section of Settings->EKOS.

openSUSE Tumbleweed KStars git INDI git
GPDX+EQMOD, CEM60EC, ASI1600+EFW+EAF+ASI290 mini
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8 months 4 weeks ago
jnowat
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Dithering question when using Phd2 and Ekos #44247
Hi Jerry, did you get dithering working while using PHD2? I've been binning2x2 while using internal guiding with direct pulses instead of using an ST4 cable, using 5pixel dithering every frame. It's been working well, even though it seems a bit overkill, but now I'm trying to experimenting with the settle setting, because I notice that with some dithering instances, tracking has a difficult time catching up, likely due to backlash.

I would imagine that if you have "receive external guide frames" checked (of course in the guiding options tab in options under the guiding module), dither would work just as well with PHD2 as with the internal guider.

I'd like to know what you find, just to have the knowledge going forward.

Best,
Jacob

Losmandy G11, Gemini II, 10" f/3.8 Newt (Ostahowski Optics),
TV Paracorr-2, 2" Starlight FT, HSM20, Pegasus UPBv2,
ASI1600MM Pro, ASI174MM Mini, ZWO LRGB, EFW, & OAG,
StellarMate on RPi3 and/or Astroberry on RPi4
KStars 3.4.1 Build 2020-02-24T07:38:50Z on Win10 (updated 20200506)
Indi ver....

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8 months 4 weeks ago
rlancaste
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Dithering question when using Phd2 and Ekos #44251
I have used PHD2 with Ekos for several years now and it works extremely well. But there were some issues introduced recently into the code. So I just spent a significant amount of time last week fixing those issues again and making a whole bunch of improvements to the PHD2 Ekos code. It obviously is not in the release yet since no release has been made, but it is available in the nightly builds and it is available on git if you want to build it yourself. But my changes will eliminate the "receive external guide frames" option entirely. So basically if you have the same camera connected to PHD2 and Ekos, it will automatically recognize that. If that is the case you will be able to receive the full frames or click "subframe" to get just the guide star image from PHD2 in Ekos. If you aren't using an INDI camera and are just connecting your guide camera directly to PHD2, the "subframe" checkbox will be disabled (and checked) and you will just be able to get the guide star image. These changes will be in the next release.

If you are planning to use 3.3.6 with PHD2, make sure you have entered a focal length for your guide scope in PHD2! Also turn on dithering in the guide options of Ekos. And finally, I would definitely recommend disabling "receive external guide frames" since that is where the issues were that I fixed. As long as you have the focal length entered in PHD2, you should get all guiding data sent back including the guide star image.

Thanks,

Rob
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8 months 4 weeks ago 8 months 4 weeks ago by jerry.
jerry
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Dithering question when using Phd2 and Ekos #44252

Hi Jerry, did you get dithering working while using PHD2? I've been binning2x2 while using internal guiding with direct pulses instead of using an ST4 cable, using 5pixel dithering every frame. It's been working well, even though it seems a bit overkill, but now I'm trying to experimenting with the settle setting, because I notice that with some dithering instances,


I haven't yet had a chance. The recent new moon was spent backcountry camping (Kejimkujik National Park) and doing time-lapse :)

I will try it soon.

120 MM Skywatcher Esprit on Celestron CGEM DX HC: GEM 5.29.7137 MC: 6.50 6.50,
ZWO ASI 224MC or QHY-5L-II-M for guiding,
Nikon Z7 8256 x 5504, 35.9 x 23.9mm 4.34 um pixel size.
1) StellarMate on RPI4
2) Kstars on Odroid-N2 on Ubuntu-mate 20.04 and
3) KStars on Astroberry on RPI3.

Please Log in or Create an account to join the conversation.

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