#1  
Old 05-09-2013, 08:53 AM
graham.hobart's Avatar
graham.hobart (Graham stevens)
DeepSkySlacker

graham.hobart is offline
 
Join Date: Nov 2008
Location: hobart, tasmania
Posts: 2,214
focal reducer for GSO RC8?

Does anybody use a reducer on a GSO Rc 8?
If so which one and is it any good?
What spacings does you use with the camera?
I am interested in the Astro Physics on on the Teleskop_Servic website but would appreciate any thoughts
Would be using it with a QSI 683 and or a DSLR.
Cheers
Graham
Reply With Quote
  #2  
Old 05-09-2013, 06:27 PM
naskies's Avatar
naskies (Dave)
Registered User

naskies is offline
 
Join Date: Jul 2011
Location: Brisbane
Posts: 1,865
I've used an AP CCDT67 successfully on my RC8:

http://www.iceinspace.com.au/forum/s...d.php?t=100797

My STF-8300M + FW + OAG + Baader 2" nosepiece places the image plane at 85 mm behind the reducer, giving exactly 0.67x reduction, i.e. f/5.36. The image circle is small though - you definitely can't use it with a full frame DSLR.

This reducer consumes a lot of back focus - with the reducer attached, I only needed one 25 mm extension tube behind my RC8 (with a 2" Moonlite focuser).

There wasn't enough back focus for my adaptive optics unit, so I stopped using the reducer. I might look at using the AP 27TVPH reducer (much more generous with back focus) when I can afford to upgrade to a larger focuser.
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 12:30 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
Testar
Advertisement