#21  
Old 21-07-2012, 01:02 PM
JohnH's Avatar
JohnH
Member # 159

JohnH is offline
 
Join Date: Feb 2005
Location: NSW
Posts: 1,226
Not sure if this will help as my setup is a ccd not a dslr. I have the FR mounted in the holder and about 3/4 of the way forward (ie towards the OTA). I have a CFW10 on the front of my ST2000 so the end of the draw tube to the ccd surface is about 33mm and the FR to ccd is about 95mm (just a bit under the recommended spacing). I get focus with about 15mm of out travel on the draw tube.

AFAIK the sensor on a DSLR is about 55mm behind the front of a Tring so the spacing should be about right with the FR is the middle of the range. you do not have the FR mounted in the holder backwards do you?

I have a Canon 20d as well so I will try it out, pretty sure it should work ok...
Reply With Quote
  #22  
Old 22-07-2012, 10:03 PM
Osirisra's Avatar
Osirisra (Ken)
Dead God

Osirisra is offline
 
Join Date: Sep 2010
Location: Western Australia
Posts: 635
I'm just about to grab a Moonlite for my RC8 as well, to be able to put the CCDT67 internally on the tube do I get the 1.5" drawtube that moonlite says is for the RC8 or do I get the 1.15" tube which they say is for the AP reducer??
Reply With Quote
  #23  
Old 23-07-2012, 05:50 AM
DavidTrap's Avatar
DavidTrap (David)
Really just a beginner

DavidTrap is offline
 
Join Date: Jun 2009
Location: Brisbane
Posts: 3,032
Talk to the guy at Moonlite - very helpful chap.

DT
Reply With Quote
  #24  
Old 24-07-2012, 05:08 AM
dp297 (Dimitris)
Registered User

dp297 is offline
 
Join Date: Jul 2011
Location: Athens, Greece
Posts: 26
Well,
I have tested my DSLR 350D with the Moonlite focuser and RC8 with the internal positioning of the CCDT67 and I can safely say that 350D will NOT focus (the focuser is attached directly to the OTA without any extension before the focuser). Not enough backfocus. It just needs a couple of mm inwards to focus but thats impossible due to the T-ring.
The only way the system reaches focus is by attaching the CCDT67 directly to the DLSR via a 30cm T2/2' adapter + T-ring and insert the thing into the focuser. It reaches focus with about 2-3cm out on the drawtube.
Reply With Quote
  #25  
Old 24-07-2012, 03:03 PM
allan gould's Avatar
allan gould
Registered User

allan gould is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 4,485
Dimitris
You have the correct spacing for your camera to ccdt67. It works like this 16mm for the ccdt67+ 30mm for your spacer+ 55mm for your t ring and camera to the chip= 101mm. Perfect spacing.
That's the way it works, if you had a qhy10 ccd the spacing from the front of the camera to the chip is 20mm which gives an extra 35mm to play with and thus you can attach the ccdt67 into the focuser.
Hope you now get some clear skies.
Allan
Reply With Quote
  #26  
Old 24-07-2012, 10:59 PM
dp297 (Dimitris)
Registered User

dp297 is offline
 
Join Date: Jul 2011
Location: Athens, Greece
Posts: 26
Quote:
Originally Posted by allan gould View Post
Dimitris
You have the correct spacing for your camera to ccdt67. It works like this 16mm for the ccdt67+ 30mm for your spacer+ 55mm for your t ring and camera to the chip= 101mm. Perfect spacing.
That's the way it works, if you had a qhy10 ccd the spacing from the front of the camera to the chip is 20mm which gives an extra 35mm to play with and thus you can attach the ccdt67 into the focuser.
Hope you now get some clear skies.
Allan
Yes, I managed to get it right.
I am just wondering, just for fun. Should I want to increase the reduction beyond 0.68 (effectively increase the distance from 101mm to 110-120mm), will I have enough backfocus or not?
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 09:00 PM.

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