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Is guiding necessary with a Celestron RASA 11"..?

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#1 Delta608

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Posted 17 January 2020 - 01:57 PM

Curios if a RASA needs guiding with all the accoutrements or is just plain fast enough...?  The 11" is now a grand cheaper so just wondering to give up my FSQ106 for that always equipment catch-up, if you know what I mean...



#2 sharkmelley

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Posted 17 January 2020 - 02:12 PM

It depends on the accuracy of your mount and your tolerance for elongated stars.

 

Mark


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#3 Delta608

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Posted 17 January 2020 - 04:14 PM

I have Losmandy G11....I am running out of room for my guide scope, leaving only an OAG..I was about to purchase he ZWOASI290MM, but may delay that.......Hmmmmmm



#4 Allaboutastro

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Posted 17 January 2020 - 04:49 PM

Depends on pixel size and mount performance.  I've never guided mine, but I don't use it that much (with the Nikon D810A) and I'm really not that picky when I do...it's more of a novelty or a toy for me right now.  If I were to get serious with it, as with something like a big ZWO/QHY chip, I'd either make sure it's on my low PE observatory mount or with an autoguider...and I'd also be more fussy about proper camera spacing.   



#5 Allaboutastro

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Posted 17 January 2020 - 04:50 PM

I have Losmandy G11....I am running out of room for my guide scope, leaving only an OAG..I was about to purchase he ZWOASI290MM, but may delay that.......Hmmmmmm

There's no reason a well corrected and aligned G11 couldn't do unguided images for 45 to 60 seconds with the RASA 11.  


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#6 freestar8n

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Posted 17 January 2020 - 04:59 PM

You may be fine not guiding but I would still dither. And dithering may have much more control when guiding vs blind - unless you have a high end mount that has no backlash in dec.

Frank
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#7 Delta608

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Posted 17 January 2020 - 08:01 PM

Thanks fellas....I think I'll wait till this GAS passes then decide...


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#8 Allaboutastro

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Posted 17 January 2020 - 08:17 PM

You may be fine not guiding but I would still dither. And dithering may have much more control when guiding vs blind - unless you have a high end mount that has no backlash in dec.

Frank

This is a great point.  The times when I've used the RASA unguided, I always bumped the mount with the handpad very slightly between exposures...or at least between occasional exposures. 


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