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Old 10-06-2013, 09:57 PM
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Manav (Yugant)
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OAG vs Guidescope for GSO 10" RC

Hi there,

Quite a few astronomers on IIS are using the GSO RC 10" and I was wondering what path they have taken towards guiding. I'm hoping to figure out what the best option for guiding a 2000mm scope in a suburban area (I have a QHY9).

Reading other threads in IIS on a similar topic has confused me a bit since some people mention the differential flexure is a given and guide-scope guiding will not yield the results required. On a flip side however, I'm worried about the a guide cam in OAG configuration picking up suitable stars for a narrowfield scope.

So far I've managed to narrow down the following options:

1. TSRCFlat2 (field flattener) with TSOAG27 (OAG) and correct adaptors from Teleskop and hope it works for QHY5. Click Here
2. Get a SV80ST APO with feather touch focuser and hope the whole thing balances on a G11 and has limited differential flexure.

Obviously the second option is much more expensive but atleast I get a widefield grab and go scope out of it.

Happy for you to add your comments/views. And if possible your current setup so I can copy and paste!

Last edited by Manav; 11-06-2013 at 10:47 AM.
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  #2  
Old 11-06-2013, 07:10 AM
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lazjen (Chris)
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I'm still sorting things out for my kit, but I'm going the TSOAG9T2 with the ST-i for the guide camera. I just didn't want to deal with possible flexure issues.
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Old 11-06-2013, 07:23 AM
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I had trouble with a QHY5 not be sensitive enough to find guide stars through an OAG at long focal lengths - sometimes required 5-10second exposures. Have had no issues since upgrading to a Lodestar.

DT

Last edited by DavidTrap; 11-06-2013 at 07:24 AM. Reason: typo
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Old 11-06-2013, 10:47 AM
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Manav (Yugant)
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Hi Chris and David - Do you guys use a FF in conjunction with your OAG?
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Old 11-06-2013, 11:48 AM
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DavidTrap (David)
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Yes, sort of.

My refractor has a dedicated flattener/reducer and the reflector has a built in corrector. My camera has a built in OAG - QSI WSG. One of the main reasons I bought this camera was the inbuilt filter wheel and OAG.

DT
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Old 11-06-2013, 12:12 PM
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lazjen (Chris)
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FF - no, not yet. I'm still in the assembly stage at this time (I've got a thread going in the beginner forum), so I'm trying to sort out the guiding issues first before I tackle other problems (mostly).
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Old 11-06-2013, 02:56 PM
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blink138 (Pat)
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hi yugant
I have a similar setup to you c11 / g11 and I use my old celestron c102 f/5 refractor as a guidescope without any problems
I generally do 180s exposures 5km from perth, no wuckers!
pat
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Old 11-06-2013, 06:32 PM
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You can mostly get away without a flattener on the RC10 with a sensor the size of the KAF-8300. I did some imaging with an RC10 and the Starlight Xpress equivalent of the QHY9. I used an OAG and also the Starlight Xpress AO-LF active optics unit. It worked out reasonably well...

Cheers,
Rick.
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Old 11-06-2013, 07:10 PM
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I ended up buying an ONAG for my RC10 (http://innovationsforesight.com) Probably not the cheapest option, but guiding has become extremely easy with it. Had to buy a lodestar though, as the QHY5 guider wasn't sensitive enough.
Erik
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Old 11-06-2013, 10:04 PM
Poita (Peter)
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The QHY5 isn't really sensitive enough, but the new and cheap ZWO camera is, I use the 9.25 with an OAG and it is the business.
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Old 11-06-2013, 10:27 PM
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Rick and Peter - Which OAG?
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Old 12-06-2013, 07:36 AM
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Marke (Mark)
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Yugant here is an old post of mine you my find helpful
http://www.iceinspace.com.au/forum/s...highlight=RC10
I have been using the hutech for a couple years now with lodestar
along with FF FR .
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Old 12-06-2013, 08:50 AM
Poita (Peter)
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I use the SX one as it is mighty slim, TE also have a really nice slim model, I'll dig out the details.
http://starizona.com/acb/Starlight-X...P3483C715.aspx
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Old 12-06-2013, 08:53 AM
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Quote:
Originally Posted by Manav View Post
Rick and Peter - Which OAG?
The Starlight Xpress OAG in my case.
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Old 13-06-2013, 08:53 AM
Poita (Peter)
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Awwww twins!
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Old 13-06-2013, 11:32 AM
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Excellent choice, Poita
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Old 13-06-2013, 05:11 PM
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Manav (Yugant)
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starlight xpress sounds like the way to go. Anyone got a FF recommendation?
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Old 19-06-2013, 11:44 PM
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Manav (Yugant)
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Just wanted to let anyone who is still following this that I ended up getting the SX Lodestar from optcorp and the TSOAG9M48 for my QHY filter Wheel + QHY9 setup. I was told my Teleskop Express to get the following adaptors:

1. Filter Wheel to OAG
2. For Lodestar to Connect to OAG
3. Nosepiece for telescope side

Let me know if I'm missing something.

EDIT - Everything arrived minus the german lollies!

Regards
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Last edited by Manav; 25-06-2013 at 11:16 PM.
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