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INDI Library v1.8.0 is Released (27 Jul 2019)

INDI Library v1.8.0 is mostly a maintenance release to fix a few bugs in several drivers.

How to improve RA Guiding

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How to improve RA Guiding was created by Lead_weight

My guiding always looks like this. My RA seems fairly stiff, so it can be difficult to balance. What, if anything can I change to improve RA guiding? It's always around .7-.8 RMS while DE is always .2-.3.

-Andrew
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1 week 4 days ago #41931
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Replied by Ihoujin on topic How to improve RA Guiding

It's not that bad as is, but it could probably be improved. Check for and carefully adjust the backlash in the RA worm gear if you can.
INDI/KStars on Raspberry Pi 3B+
Lubuntu 16.04
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
Last edit: 1 week 4 days ago by Ihoujin.
1 week 4 days ago #41933

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Replied by wvreeven on topic How to improve RA Guiding

The question also is: does it HAVE TO BE improved? If the stars in your images are round and crisp then the answer is no.


Wouter
ASI1600MM-Pro Cooled 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
1 week 3 days ago #41938

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Replied by ChrisRowland on topic How to improve RA Guiding

Check for and carefully adjust the backlash in the RA worm gear if you can.

Why would backlash in the Ra axis matter? The axis is always being driven in the same direction and all that guiding is doing is changing the drive rate , not the direction.
1 week 3 days ago #41941

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Replied by Spartacus on topic How to improve RA Guiding

Hi Andrew,

My guiding used to look just like yours, probably worse. What mount are you using and are you using the internal guider?
The internal guider is fairly simple and no where near as configurable as PhD2. It works well for well behaved mounts but less useful for unruly ones. :) My stars were affected by this type of guiding so I had to find an alternative. For me the change to PhD2 dramatically changed the distribution of my guiding plot so that it was more even and stars improved. If you are using an NEQ6Pro with EQMod I would recommend the Rowan belt mod as it improved my guiding out of sight. PhD2 does take a bit of setting up if the default settings do not work well but it worked well for me.

Mike
1 week 3 days ago #41948

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Replied by DerPit on topic How to improve RA Guiding

What mount is this? One thing that can affect guiding is if reading out the camera data takes too long, and the correction you apply is already 'too old'. In dount make sure you do subfield readout.
Apart from that, as Mike says, have a look at PHD2, especially the PPEC mode. I had very good results with that with my old GP-DX.
openSUSE Tumbleweed KStars git INDI git
GPDX+EQMOD, CEM60EC, ASI1600+EFW+ASI290 mini
1 week 3 days ago #41951

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Replied by Lead_weight on topic How to improve RA Guiding

The mount is a CGX. I'm guiding with an OAG on an Edge 11. The mount hand controller is set to .85 guide rate, and I'm using that in EKOS.

I've used PHD2 before, and can try it again. I just find it's been less reliable with earlier versions of EKOS. Maybe now it's a bit more stable.
-Andrew
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Mac Observatory - All about using the Mac for Astrophotography: www.macobservatory.com
Astrobin: www.astrobin.com/users/Lead_Weight/
1 week 3 days ago #41952

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Replied by wbirk on topic How to improve RA Guiding

hi!
well, in my opinion EKOS guiding would be fine IF there would be an aggressiveness factor for RA and Dec ...
yours
wolfi
1 week 3 days ago #41955

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Replied by Lead_weight on topic How to improve RA Guiding

From what I can tell over on the Celestron forums is just to only guide in DE. I’m willing to try. Is there a setting to turn off RA guiding? I’m not in front of EKOS at the moment, or I would look in the settings.
-Andrew
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Mac Observatory - All about using the Mac for Astrophotography: www.macobservatory.com
Astrobin: www.astrobin.com/users/Lead_Weight/
1 week 3 days ago #41973

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Replied by DerPit on topic How to improve RA Guiding

Interesting. Does the mount have its own PEC? That indeed has chances to interfere with guideing.
Yes, EKOS has radio buttons that allow to guide only one axis and/or only one direction.
In PHD2 you'd have to set the min move to a really high number (I think it is limited to 20px).

openSUSE Tumbleweed KStars git INDI git
GPDX+EQMOD, CEM60EC, ASI1600+EFW+ASI290 mini
1 week 3 days ago #41974
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Replied by Lead_weight on topic How to improve RA Guiding

Awesome, I can try this. I also just learned through other forums that the CGX has an issue with RA out of the box due to the gear mesh being too loose causing too much wobble like I’m seeing. Turns out there’s a built in adjuster, and I just have to take the gear cover off and adjust the RA to mesh better. I’m pretty positive now that this is the issue, as it’s widely reported, and I only need to do a search on RA and CGX to find it.
-Andrew
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Mac Observatory - All about using the Mac for Astrophotography: www.macobservatory.com
Astrobin: www.astrobin.com/users/Lead_Weight/
1 week 3 days ago #41975

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Replied by Ihoujin on topic How to improve RA Guiding

ChrisRowland wrote:

Check for and carefully adjust the backlash in the RA worm gear if you can.

Why would backlash in the Ra axis matter? The axis is always being driven in the same direction and all that guiding is doing is changing the drive rate , not the direction.

Ordinarily yes. But in poorly tuned cases it can have a noticeable amount of wiggle room, and that's no good. Especially if the balanced load is opposite the driving forces.
INDI/KStars on Raspberry Pi 3B+
Lubuntu 16.04
Skywatcher HEQ5 Pro Mount
Canon 600D Camera
Orion SSAG @280mm Guide Scope
PHD2
Adafruit Motor Hat shield
Adafruit GPS Module
Generic Bluetooth Joystick.
Startech 7 port powered USB Hub.
1 week 3 days ago #41983

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