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INDI Library v1.9.7 Released (29 Jul 2022)

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

Auto meridian flip in Capture module?

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Hi!

I'm trying to understand how to use the "meridian flip" setting in the Capture Module. I can check so it makes a meridian flip if the hour angle is above a certain value. What is the value I am to put here? The maximum allowed angle for the capture duration, or what? I've not been able to find a description that I can use...

Magnus

Celestron C11, Skywatcher 100 ED Pro
Losmandy G11
Atik 383L+, ASI294
6 years 4 months ago #7649

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Please check the capture module documentation . If it's not clear, please let me know.
Jasem Mutlaq
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6 years 4 months ago #7652

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Hi!

I think what I don't understand, is how I calculate the hour angle limit. I know the limits for the scope, that is, how many degrees east of the mount it can move. But how do I transform that to an hour angle limit?

I guess I simply could calculate the time when the object crosses the meridian and use 0 as the hour angle limit - but then again, how do I find that?

Magnus

Celestron C11, Skywatcher 100 ED Pro
Losmandy G11
Atik 383L+, ASI294
Last edit: 6 years 3 months ago by Magnus Larsson.
6 years 3 months ago #7874

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Hi!

Yes, well, I guess I am just confused here. Sorry for producing confusing posts too. But I simply cannot make the mount do a meridian flip with the capture module. So: is it supported for the Losmandy Gemini? I note that the instructions say something about if the mount supports it, and maybe the driver for the Gemini lacks this function?

Attached is log files (verbose output) for an attempt to produce a meridian flip

Magnus

Celestron C11, Skywatcher 100 ED Pro
Losmandy G11
Atik 383L+, ASI294
6 years 3 months ago #7888
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IF your mount passes the meridian, and then you ask it to go to the same location it is currently tracking, does it perform a meridian flip or not?

Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
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Last edit: 6 years 3 months ago by Jasem Mutlaq.
6 years 3 months ago #7897

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Hi!

Ok, I've been experimenting. Today, when the star crosses the meridian and exceeds the hour angle, the capture module says it should do a meridian flip. Then immediately (7 seconds later) it says it is completed and takes a new picture. The scope does not move.

I've attached log files below.

Magnus

Celestron C11, Skywatcher 100 ED Pro
Losmandy G11
Atik 383L+, ASI294
6 years 3 months ago #7915
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Magnus,

Please read this Losmandy Manual . Page 33, Section 3.3.4

And then in 5.3.10.2.6

So if you set your Set GoTo to 95 for example, you must be the Ekos Meridian Flip HA to be issues after 95 degrees is passed. 1 Hour = 15 Degrees. For 5 degrees = 0.33 hours. To be safe, set the Ekos HA to 0.35 or 0.4 even. When Ekos issues a GOTO when the mount HA is 0.4 hours (6 degrees west of the meridian), the mount should flip because it is passed the Set GoTo limit of 5 degrees passed the meridian.

I hope this clears it.
Jasem Mutlaq
Support INDI & Ekos; Get StellarMate Astrophotography Gadget.
How to Submit Logs when you have problems?
Add your observatory info
The following user(s) said Thank You: Magnus Larsson
6 years 3 months ago #7917

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Hi!

Great!! I hadn't noticed that in the manual.... You really are amazingly helpful, Jasem!!

So: I set the SetGoTo to 90, and then run a seris of exposures on a star crossing the meridian. And now it works! It initiates a meridian flip!

Hrm. Update: it is a bit funny. I'm doing a series of experiments, targeting a spot precisely before the meridian and running a capture to get a meridian flip. At times it waits until the picture is taken, but not always. Mostly, it does the flip in the middle of an exposure. And in the session here, with the logs below, it did the meridian flip in the middle of the exposure, and then after the exposure, reported in the capture window again that is iniitated a meridian flip - so twice for the same session. The scope moved the first, but not the second time (as the flip was already made).

In either case: it starts the next exposure directly, without waiting for the flip to be finished.

Is there anything going on here that I can do something with?

Magnus

Celestron C11, Skywatcher 100 ED Pro
Losmandy G11
Atik 383L+, ASI294
Last edit: 6 years 3 months ago by Magnus Larsson. Reason: Update.
6 years 3 months ago #7919
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Hoi Mlarson, Jasem

Did you already fixed this issue, I am running against an simalar issue, See tread indilib.org/forum/development/1406-drive...html?start=468#34273
I discovered de following in relation to my mount the OnStep. I can define the degrees when the flip starts in my mount. For example I define 5 minutes passing the meridian.
I discovered for my situation that the HA must be lower than the 5 minutes. If i define HA on 0.00 i see that it waits to finish the exposure and after that Ekos start the Flip. However i am running in a situation that the flip is not finished will ekos times out, does a retry and initiate the next capture which cause the still running flip to stop. :-( My slew speed is to low if you compair that with the video of Jasem. I think we need extra setting beside the HA which define the time a flips need and that dat differents between mounts. I am also aware that in worse case scenarios for example my max exposure with this setting is 5 minutes is the exposure start starts 1 second before HA 0.0.0

I see here some more development needed and this function is essential for astrophotographers, i am move from the FS2 to OnStep because FS2 has no flip and park and EKOS looks the the ultime program to run unattained for photography , i am not programmer so iam relay on the programmers in the forum.

For me it's not clear how we get attention to this and are we the only ones having this problem

Chris
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3 years 6 months ago #34326

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Hoi there will be a update soon in Kstars zie link indilib.org/forum/development/1406-drive...html?start=468#34273

Chris
3 years 6 months ago #34486

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