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INDI Library v1.9.8 Released (29 Sep 2022)

Bi-monthly INDI Library released with new drivers and bug fixes.

phd2: px - arcsec - pixel scale?

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  • Thank you received: 7
Hi I have been using the internal guider mostly, but want to try out phd2.
I have the equipment connected (indi mount->Eqmod, indi camera -> QHY) and this  seems to work ok. However I sometimes get warning in Ekos PHD2: Please set CCD and telescope parameters in PHD2, Pixel Scale is invalid.

Also I cannot change from px to arcsec graphs - I presume this means phd2 doesn't seem to know the focal length of my guide scope ?

However when I look at INDI Options panel in phd2 I can see it has picked up the correct telescope profile with the the correct focal lengths and apertures.
Also in the INDI Options-> Guide Camera -> Image info  I see the correct pixel sizes and chip dimensions are picked up from INDI correctly.
Do I need to set some parameters in phd2 ? 
I was presuming that if I set the correct indi drivers in phd2 (Eqmod and QHY) then it would automatically
pick up everything from INDI - which it may be doing but I'm not entirely sure.
10 months 2 days ago #80042

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Sounds like you need to set the guide scope focal length in the PHD2 brain
 
-- Ken
RPi3 Ubuntu Server 20.04, Windows 10 AMD64, AAEON UP Core Ubuntu Desktop 20.04
Avalon M-Uno, EQ6 Pro, Atik420, ASI1600MM-C, ASI120MM-S, DBK21AU04, ZWO EFW, Optec TCFSi
Vixen R150S, GSO RC8, ST80
The following user(s) said Thank You: Nick Birkett
10 months 1 day ago #80050
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Hi Ken.
Excellent. Many thanks. Not sure why it doesn't do this automatically since phd2 already has this data from INDI.
Anyhow I've set set that as you described and now I'm getting arcsecs rather than just pixels.
Cheers,
Nick
10 months 1 day ago #80051

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PHD2 only gets the camera data from INDI and that does not include the focal length of the guide scope. Could be worth an enhancement request in PHD2 to allow the server interface to receive focal length from the client but that would also require a change in EKOS to send it.
-- Ken
RPi3 Ubuntu Server 20.04, Windows 10 AMD64, AAEON UP Core Ubuntu Desktop 20.04
Avalon M-Uno, EQ6 Pro, Atik420, ASI1600MM-C, ASI120MM-S, DBK21AU04, ZWO EFW, Optec TCFSi
Vixen R150S, GSO RC8, ST80
10 months 1 day ago #80052

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It's worthwhile getting the true focal length of your guide scope by using the plate solver. Don't rely on manufacturer specifications for the most accurate figures.
By doing so, you'll get a more accurate measurement of the RMS.
INDI/KStars on Raspberry Pi 4, 4gb
Raspbian Buster with AstroPi3 script configuration
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG/ASI120mm @280mm Guide Scope
PHD2
Waveshare Stepper Motor Board - DIY Focuser
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
10 months 1 day ago #80056

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Hi Ken. yes I agree. It does seem a bit silly that you can see the focal lengths in phd2 Eqmod info but it then needs setting elsewhere.
10 months 1 day ago #80069

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Thanks Andrew. That's worth knowing. My FL's are same as from platesolve ( I used Ekos stellarsolver in the past they turn out the same
as specs).
10 months 1 day ago #80070

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