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Celestron CGX-L Guide Speed for PHD2 Configuration

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#1 AXAF

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Posted 11 June 2021 - 06:57 AM

I am helping a friend configure PHD2 for his Celestron CGX-L. What is the guide speed

of the mount with respect to sidereal units (e.g. 0.9x sidereal, etc).

 

Thanks in advance.



#2 DuncanM

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Posted 11 June 2021 - 09:45 AM

I am helping a friend configure PHD2 for his Celestron CGX-L. What is the guide speed

of the mount with respect to sidereal units (e.g. 0.9x sidereal, etc).

 

Thanks in advance.

Typically .5x sidereal, but I would experiment with .25x if you're using an OAG.


Edited by DuncanM, 11 June 2021 - 09:45 AM.


#3 rgsalinger

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Posted 11 June 2021 - 10:20 AM

I would check with Celestron to see what they recommend. The faster the mount can make the corrections the better. That's why Astro-Physics recommends 1x for their mounts. 

 

A one arc second correction at .5x sidereal takes .14 seconds to execute and it's operating after the fact.

 

If the manufacturer makes no recommendation I think I'd start fairly high and what I got and then work my way down.

 

The factory recommendations for both of my mounts is.5x and that's what I use.

 

FWIW I use an OAG and use that guide rate with scopes ranging from 350mm to 4700mm of focal length. The guiding algorithm has no sensitivity to where the information (image) is coming from. 

 

Rgrds-Ross



#4 Ray Hansen

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Posted 12 June 2021 - 11:23 AM

It will vary a bit depending on the scope and weather. I have a CGX-L typically set at .99  and do an ASPA to get it pretty much dead on. I get a total RMS about .3 with a wide field and .6 with a C11. On occasion, I've set the speed down a little, but it never has done much for the error rates.




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