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Can someone let me know if these numbers for guiding are considered good?

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#1 Jay6879

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Posted 15 May 2021 - 08:37 AM

So I had my first successful night out with the asiair pro and guide scope. This was my first time guiding so I'm unsure if these numbers for dec and RA would be considered good? My mount is a Star Adventurer 2i so I can't guide on dec.

 

 

Screenshot_20210514-230847_ASIAIR.jpg

 

I know the lower the number the better, but what would be considered "good"?



#2 Dynan

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Posted 15 May 2021 - 08:47 AM

Whatever numbers give you an image you like is GREAT!

 

You don't mention what your equipment setup is, but short focal lengths are more forgiving.

 

If your guiding is limited by the seeing, you're doing the best you can. I've had guiding in the 0.20's rms, and the next night, without touching a thing, couldn't get below 1.20 rms because of a change in the weather.


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#3 Jay6879

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Posted 15 May 2021 - 08:55 AM

Whatever numbers give you an image you like is GREAT!

 

You don't mention what your equipment setup is, but short focal lengths are more forgiving.If your guiding is limited by the seeing, you're doing the best you can. I've had guiding in the 0.20's rms, and the next night, without touching a thing, couldn't get below 1.20 rms because of a change in the weather.

 

Sorry, my camera lens is 300mm. 480mm equivalent because of aps-c. I managed to get 5 minute exposures without any star trails, I'm curious to see how much longer i could've pushed it but I just wanted to get on with capturing images!



#4 RogeZ

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Posted 15 May 2021 - 09:00 AM

Sorry, my camera lens is 300mm. 480mm equivalent because of aps-c. I managed to get 5 minute exposures without any star trails, I'm curious to see how much longer i could've pushed it but I just wanted to get on with capturing images!

Aps-c or not, you are still shooting at 300mm. This is a piece of misinformation that keeps plugging everywhere. 
 

Whats your scale?


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#5 Jay6879

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Posted 15 May 2021 - 09:05 AM

Aps-c or not, you are still shooting at 300mm. This is a piece of misinformation that keeps plugging everywhere. 
 

Whats your scale?

 

If I did the math correctly (had to Google it) my scale is 2.86? I have a Canon t3i



#6 RogeZ

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Posted 15 May 2021 - 09:49 AM

So that means your RMS is below your scale, you are ok.

Since you are shooting at almost 3”, an improvement in guiding will show little if any improvent in star shape (which is the goal of guiding and nothing else)
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#7 bobzeq25

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Posted 15 May 2021 - 10:02 AM

It's all too easy to get wrapped up in guiding numbers.  They're not goals in themselves, they're diagnostic tools to help fix problems with your image.


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#8 Jay6879

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Posted 15 May 2021 - 02:00 PM

So that means your RMS is below your scale, you are ok.

Since you are shooting at almost 3”, an improvement in guiding will show little if any improvent in star shape (which is the goal of guiding and nothing else)

 

Do you mean an improvement on the numbers I posted will show little improvement? Cause I was able to get 5 minute exposures with no star elongation at 300mm when I could barely hit 60s before!



#9 Jay6879

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Posted 15 May 2021 - 02:01 PM

It's all too easy to get wrapped up in guiding numbers.  They're not goals in themselves, they're diagnostic tools to help fix problems with your image.

 

Huh, alright I need to end up reading more into what this is all about then!



#10 bobzeq25

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Posted 15 May 2021 - 02:02 PM

Do you mean an improvement on the numbers I posted will show little improvement? Cause I was able to get 5 minute exposures with no star elongation at 300mm when I could barely hit 60s before!

And _that's_ what you need to know.  Results, not abstract numbers.


Edited by bobzeq25, 15 May 2021 - 02:02 PM.

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