ICEINSPACE
Most Read Articles
Moon Phase
CURRENT MOON Waxing Crescent
4.2%
The Sun Now
Time Zones
Sydney*
2:22 am
Perth
11:22 pm
Auckland*
4:22 am
New York
10:22 am
Paris
4:22 pm
GMT
3:22 pm




Go Back   IceInSpace > Equipment > Equipment Discussions

Reply
 
Thread Tools Rate Thread
  #1  
Old 14-11-2017, 08:21 AM
John K's Avatar
John K
Registered User

John K is offline
 
Join Date: Sep 2005
Location: Melbourne
Posts: 1,266
Advice on GSO RC 10" or 12" set up with EQ8

Hi guys,

Doing some research on a potential new set up revolving around either a GSO RC 10Ē or 12Ē with an EQ8 and something like an ASI1600 camera.
It will need to be a portable and be used at a Dark sky site.

For those currently using the GSO RCís, my questions are:

- Is a GSO RC 12 scope at 23.7kg considered portable for one person?

- How does the Astro-Physics AP-CCDT67 go with reducing focal length to f/6

- Would like a lighter version of the EQ8 tripod Ė the Sky Watcher tripod weights a hefty 30kg. Are there any alternatives out there? E.g. https://www.altairastro.com/skywatch...nc-tripod.html

- Can someone recommend a good focuser option for a mono, filter wheel and OAG set up. Does something like a Moonlite CSL 2.5" Large Format SCT/RC Focuser do the trick and what accessories will it need?


Look forward to everyone's advice.

Clear skies.

John K.
Reply With Quote
  #2  
Old 14-11-2017, 11:06 AM
Paul Haese's Avatar
Paul Haese
Registered User

Paul Haese is offline
 
Join Date: Jan 2009
Location: Adelaide
Posts: 8,774
John my answers in descending order:

Lifting 23kg up to shoulder height can be a bit of a problem. It's not an easy lift when you are trying to slip into the dove tail saddle. However, yes you can use it portable but it would not be my preference with a 12"

I have not used that reducer but I hear it is good with APS size sensors. Though a few tell me that it is ok for a larger sensor. I would say it would be fine with the APS sensor but would be wary about using full frame with it.

Don't know about the tripod.

I found that only two focusers worked well with a big camera on the back of the RC12. The Atlas or the Feather Touch 3". I don't know about the Moonlite. My recent use of a Moonlite CRL 2.5" with my QSI showed considerable movement when used with a Newtonian. It might actually be ok for use on the back of the RC but I suspect you would need something bigger. To that end I am waiting on a Moonlite Night Crawler (heavy) to use with my RC12. My policy now with focusers is go heavy duty.

Hope some of that helps.
Reply With Quote
  #3  
Old 14-11-2017, 01:32 PM
John K's Avatar
John K
Registered User

John K is offline
 
Join Date: Sep 2005
Location: Melbourne
Posts: 1,266
Thanks Paul - good info.

For a 12" I might need this approach:

https://www.youtube.com/watch?v=Ge1zG8-Y1kA

John K.
Reply With Quote
  #4  
Old 14-11-2017, 02:25 PM
lazjen's Avatar
lazjen (Chris)
PI cult member

lazjen is offline
 
Join Date: Dec 2012
Location: Brisbane
Posts: 1,378
I've got an RC10, a Moonlite focuser, the ASI 1600MM and the Astro-Physics AP-CCDT67 - on a G11.

I can just comfortably handle the RC10 onto the mount, so going heavier would not be an option for me.

The Moonlite focuser works very well and holds the gear well. If you get a heavier camera, you might need something a bit stronger. For an ASI1600 though it will not be a problem.

For the reducer, I mostly used that with an ST8XE and it gave a flat field. I think I've used it with the ASI1600 as well (I got a refractor around the same time and have been using that more recently) and again I seem to recall no issues with the field.

I've been using 1.25" filters with the ASI1600, but I'm in the process of switching to 36mm to hopefully reduce the vignetting a bit more (and they should be better quality filters, etc).

For an OAG, I use the TS OAG - it's about 9mm? in width I think - very thin.

For the ASI1600, most people tend to use the ZWO FW with it. I went Xagyl instead as at the time the ZWO version wasn't quite ready. I think either should be fine.
Reply With Quote
  #5  
Old 14-11-2017, 03:28 PM
doppler's Avatar
doppler (Rick)
Registered User

doppler is offline
 
Join Date: Nov 2012
Location: Mackay
Posts: 1,082
Quote:
Originally Posted by Paul Haese View Post
Lifting 23kg up to shoulder height can be a bit of a problem. It's not an easy lift when you are trying to slip into the dove tail saddle.
I find it easier and safer to take the tube out of the ring cradle and fit that to the mount first. It's quite easy to lift the optical assembly into an open cradle. Works for me with my 10" f5 newt.
Reply With Quote
  #6  
Old 14-11-2017, 03:42 PM
John K's Avatar
John K
Registered User

John K is offline
 
Join Date: Sep 2005
Location: Melbourne
Posts: 1,266
Quote:
Originally Posted by doppler View Post
I find it easier and safer to take the tube out of the ring cradle and fit that to the mount first. It's quite easy to lift the optical assembly into an open cradle. Works for me with my 10" f5 newt.
Thanks - I'm afraid the GSO RC's I'm looking at have a Truss tube with the attachment plate attached for the mount.
Reply With Quote
  #7  
Old 14-11-2017, 05:15 PM
Paul Haese's Avatar
Paul Haese
Registered User

Paul Haese is offline
 
Join Date: Jan 2009
Location: Adelaide
Posts: 8,774
Quote:
Originally Posted by John K View Post
Thanks Paul - good info.

For a 12" I might need this approach:

https://www.youtube.com/watch?v=Ge1zG8-Y1kA

John K.
John, I would not buy the tubed version, the truss version is better and holds focus for a lot longer. I found that the tube version was a pain in holding focus, whereas once cooled the truss version gives about 2 hours before needing a refocus.
Reply With Quote
  #8  
Old 14-11-2017, 05:49 PM
DJT (David)
Registered User

DJT is offline
 
Join Date: Nov 2011
Location: Sydney
Posts: 1,162
Hi John

I canít talk to the weight of the scope as I have the RC8 but I use the moonlight focuser and I can happily hang an MMOAG with an STL6303e plus filter wheel for 8 2Ē filters. It will have no problem with the imaging train you are thinking about. It will hold focus pretty much all night with the CF Tube.
I also have the ASI1600, OAG and ZWO filter wheel. Again, no issue with that configuration.


I donít use a flattener and with the smaller chip itís not needed.
Ron at Moonlite will help with accessories but would suggest threaded connections wherever possible. He has a few options there as well

PS: just read Paulís comments. My experience is my experience with a CF tube RC8. Others may have different ones

Cheers

Last edited by DJT; 14-11-2017 at 06:20 PM. Reason: Hmm moment
Reply With Quote
  #9  
Old 15-11-2017, 11:10 AM
John K's Avatar
John K
Registered User

John K is offline
 
Join Date: Sep 2005
Location: Melbourne
Posts: 1,266
Thanks for all of the advice everyone - appreciated.

I would only be looking at a Truss tube not a walled tube so not an issue. The video I shared was more in terms of the use of a scissor lift. I guess an extra thick CF tube could work, but that would require re-tubing the scope if I wanted to use the video method of moving a heavy scope around.

I guess from a portability perspective, the GSO RC 10" on a G11 rather than EQ8 could be a lower cost alternative, and perhaps I would also then save a bit on the focuser as Moonlite seems a bit cheaper than Feathertouch.

As always, everything is about compromise in some way - cost vs weight vs stiffness vs portability vs aperture/focal length!

One other issue for me is imaging at F/8 with a portable set up where most images will have to be gathered over 2 nights (my typical dark sky get away: Night one polar align and get Luminance Channel; Night 2 More Luminance and then R, G, B). This is why I would love the 12" but with a focal reducer at f/6.

Any other comments are welcomed.
Reply With Quote
  #10  
Old 17-11-2017, 09:59 PM
Star Catcher (Ted Dobosz)
Registered User

Star Catcher is offline
 
Join Date: Feb 2006
Location: Bankstown
Posts: 904
Well John I have the RC10 CF, moonlite and STL6303 running on my field G11. Lifting the tube is about as heavy as I would want to lift. I also have the CCDT67 which doesn't fully handle the 6303 sensor size. So I tend not to use it. The moonlite handles the weight fairly well (using the focus motor and locked shaft) and I have not noticed any great focus shift over several hours, but then my imaging "radar" may not be switched on as intensely as other imagers.
Ted
Reply With Quote
  #11  
Old Yesterday, 08:31 AM
John K's Avatar
John K
Registered User

John K is offline
 
Join Date: Sep 2005
Location: Melbourne
Posts: 1,266
Quote:
Originally Posted by Star Catcher View Post
Well John I have the RC10 CF, moonlite and STL6303 running on my field G11. Lifting the tube is about as heavy as I would want to lift. I also have the CCDT67 which doesn't fully handle the 6303 sensor size. So I tend not to use it. The moonlite handles the weight fairly well (using the focus motor and locked shaft) and I have not noticed any great focus shift over several hours, but then my imaging "radar" may not be switched on as intensely as other imagers.
Ted
Thanks Ted - I think the 10" is the way to go with portability and might just bite the bullet and go with the EQ8. I would rather have a heavier mount and save my weight lifting for that rather than the tube assembly. I would then upgrade to what I really want which is a 14" RC when I can set up a permanent arrangement.

Bummer about the AP focal reducer. I'll do some more calcs - I think even with even a smaller chip CCD camera it may provide the type of field I am looking for and give me the f/6 ratio for faster captures.
Reply With Quote
  #12  
Old Yesterday, 08:40 AM
RickS's Avatar
RickS (Rick)
PI cult recruiter

RickS is offline
 
Join Date: Apr 2010
Location: Brisbane
Posts: 8,844
I successfully used the A-P 27TVPH reducer with an RC10, albeit with an Atlas focuser (which helped a bit with back focus.)

Cheers,
Rick.
Reply With Quote
  #13  
Old Yesterday, 09:36 AM
John K's Avatar
John K
Registered User

John K is offline
 
Join Date: Sep 2005
Location: Melbourne
Posts: 1,266
Quote:
Originally Posted by RickS View Post
I successfully used the A-P 27TVPH reducer with an RC10, albeit with an Atlas focuser (which helped a bit with back focus.)

Cheers,
Rick.
Thanks Rick - good info.
Reply With Quote
  #14  
Old Yesterday, 03:43 PM
John K's Avatar
John K
Registered User

John K is offline
 
Join Date: Sep 2005
Location: Melbourne
Posts: 1,266
Did forget to ask on my original post - is there anyone who is Melbourne based who has either a 10" or 12" truss tube GSO RC?

John K.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 01:22 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Advertisement
SkyWatcher Star Discovery
Advertisement
Bintel
Advertisement
Lunatico Astronomical
Advertisement
OzScopes Authorised Dealer
Advertisement
Meade Instruments
Advertisement
Atik 16200
Advertisement
Tasco Australia
Advertisement
NexDome Observatories
Advertisement
FLI Cameras and Imaging Accessories
Advertisement
Astronomy and Electronics Centre
Advertisement