#1  
Old 01-04-2008, 10:27 AM
cookie8's Avatar
cookie8 (Vincent)
Hooked since Halley's

cookie8 is offline
 
Join Date: Dec 2005
Location: Baulkham Hills,NSW
Posts: 790
Off-axis guider: Advice needed!

Dear All
I am new to astrophotography. I reckon I've got everything required for prime-focus photography except a OAG to attach to my WO ZenithStar 2" focuser. What brand is available and where can I purchase one?
Please advise to relief my photography fever!
Cookie
Reply With Quote
  #2  
Old 01-04-2008, 11:15 AM
astroboy's Avatar
astroboy
Registered User

astroboy is offline
 
Join Date: Dec 2005
Location: Lake Bathurst NSW
Posts: 670
Hi Cookie
I've found off axis guiders can work well with large scopes autoguiding with a guide camera but for manual guiding in small scopes its often very hard to find a guide star particularly away from the milky way.
It will be more expensive but buying a cheap small scope ( with solid focuser ) and rings mounted on top of your imaging scope.
This will also be heavy so you will need a sold mount but thats a good thing to have anyway good tracking will make manual guiding much easyer.
Have you tried photographing with good camera lenses ? its a great way to start.

Zane
Reply With Quote
  #3  
Old 01-04-2008, 02:34 PM
cookie8's Avatar
cookie8 (Vincent)
Hooked since Halley's

cookie8 is offline
 
Join Date: Dec 2005
Location: Baulkham Hills,NSW
Posts: 790
Thanks Zane
As you can see, I have a basic motorised mount with hand controller;polar scope;WO 80mm refractor with camera adaptor,t-ring and luminated reticule EP. The only missing link is a OAG. I rang Andrews today but they have nothing in stock for a refractor. I've come this far I wouldn't consider any other setup without trying this one.
Any advice?
Cookie
Reply With Quote
  #4  
Old 01-04-2008, 02:42 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
I looked long and hard for a OAG for a refractor and ended up using one designed for SCT. I also needed the SCT adapter to fit into the 2"focuser. In the end I found it so frustrating I gave up and bought a guidescope. I'm much happier now.
Reply With Quote
  #5  
Old 01-04-2008, 04:26 PM
cookie8's Avatar
cookie8 (Vincent)
Hooked since Halley's

cookie8 is offline
 
Join Date: Dec 2005
Location: Baulkham Hills,NSW
Posts: 790
Hi Zane
Yes I guess I should start with some wild angle shots with the DSLR piggyback on top and manually guided(up to a few minutes) by the refractor.However I still cannot find a suitable piggyback camera bracket. Any suggestion guys?
Cheers
Cookie
Reply With Quote
  #6  
Old 01-04-2008, 04:34 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
I use a Manfrotto 484RC2 ball and socket. It carries the 300D and 135mm lens pretty well though that is about all I would put on it. Mind you the 135mm lens is heaps heavier than the camera

I got mine from www.centre.net.au but they don't seem to have them anymore. Camerahouse should have them
Reply With Quote
  #7  
Old 01-04-2008, 04:35 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
http://www.camerastore.com.au/ProSho...ad_details.htm

http://www.qualitycamera.com.au/prod...0cf00d12ab1bc4

http://www.myshopping.com.au/PR--223...Mini_Ball_Head
Reply With Quote
  #8  
Old 01-04-2008, 05:07 PM
cookie8's Avatar
cookie8 (Vincent)
Hooked since Halley's

cookie8 is offline
 
Join Date: Dec 2005
Location: Baulkham Hills,NSW
Posts: 790
HI Paul
Thanks heaps for your info.
But..... how do you attach this ball joint head to the refractor?
Cookie
Reply With Quote
  #9  
Old 01-04-2008, 06:07 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
Ah now that is the tricky bit.

I have a short piece of aluminium bar (40mm x 4 mm) attached to the top of the tube rings. I have a hole drilled in the bar and the screw goes through the bar into the bottom of the manfrotto. Works a treat.

I'll take a photo and post it.


Edit: Here's one I prepared earlier. It also has the advantage of making the rings a bit more rigid as well which is a bonus.
Attached Thumbnails
Click for full-size image (IMG_2958 (Medium).JPG)
39.3 KB20 views
Reply With Quote
  #10  
Old 01-04-2008, 07:15 PM
seeker372011's Avatar
seeker372011 (Narayan)
6EQUJ5

seeker372011 is offline
 
Join Date: Oct 2004
Location: Sydney
Posts: 3,531
Quote:
Originally Posted by [1ponders] View Post
Ah now that is the tricky bit.

I have a short piece of aluminium bar (40mm x 4 mm) attached to the top of the tube rings. I have a hole drilled in the bar and the screw goes through the bar into the bottom of the manfrotto. Works a treat.

I
stoopid question alert : how do you drill aluminium?i wanted to use a square aluminum section for a similar set up but it was impossible for my drill /drill bits

I tried and tried but gave up and used a piece of wood-which by the way has served me well for two years or more but Alu looks more professional
Reply With Quote
  #11  
Old 01-04-2008, 08:20 PM
[1ponders]'s Avatar
[1ponders] (Paul)
Retired, damn no pension

[1ponders] is offline
 
Join Date: Nov 2004
Location: Obi Obi, Qld
Posts: 18,778
I just used a sharp drill. Actually I used 2 sharp drills, a fine one first and then the right size. From memory if you try to drill through a thick piece of aluminium with a large drill, the Al "gunks" (technical term) the bit.
Reply With Quote
  #12  
Old 02-04-2008, 10:51 AM
gbeal
Registered User

gbeal is offline
 
Join Date: Oct 2004
Location: New Zealand
Posts: 4,301
Use some kero as well, to lubricate it, I have plenty of fuel drain stuff if you want, LOL
Reply With Quote
  #13  
Old 02-04-2008, 02:20 PM
cookie8's Avatar
cookie8 (Vincent)
Hooked since Halley's

cookie8 is offline
 
Join Date: Dec 2005
Location: Baulkham Hills,NSW
Posts: 790
Quote:
Originally Posted by [1ponders] View Post
Ah now that is the tricky bit.

I have a short piece of aluminium bar (40mm x 4 mm) attached to the top of the tube rings. I have a hole drilled in the bar and the screw goes through the bar into the bottom of the manfrotto. Works a treat.

I'll take a photo and post it.


Edit: Here's one I prepared earlier. It also has the advantage of making the rings a bit more rigid as well which is a bonus.
That's a wonderful setup Paul. Thanks for your tips.
Cookie
Reply With Quote
  #14  
Old 02-04-2008, 11:17 PM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 7,019
OAG for refractors

Back to your original question: I agree with Paul, use one designed for a SCT and get it to fit your scope using the 2" Orion Prime Focus adaptor.
I've tried both the Meade and Celestron OAG and would recommend the Celestron; the adjustments are easier and the camera can be rotated without loosening the body.
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 10:34 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Advertisement
OzScopes Authorised Dealer
Advertisement
Celestron Australia
Advertisement
SkyWatcher Australia
Advertisement
NexDome Observatories
Advertisement
Lunatico Astronomical
Advertisement
Meade Australia
Advertisement
Bintel
Advertisement
Astronomy and Electronics Centre
Advertisement