#1  
Old 23-04-2013, 08:45 AM
niko's Avatar
niko
Registered User

niko is offline
 
Join Date: Feb 2007
Location: Melbourne, Victoria
Posts: 1,053
DSLR and x4 powermate - not coming to focus

So, finally took the plunge and got an EQ6 for the 8" newt I bought off a member here - which has had the primary mirror moved up the tube. Set it all up on the weekend for a test run.

I managed to get the DSLR in focus with a x2 barlow (2") but couldn't find focus with the x5 powermate.

For x2 I had camera, t-ring, short ext barrel, barlow and longer extension tube

Trying the x5 I unscrewed the bottom of the powermate and went straight from t-ring to it and then various combinations of extension tubes without any luck.

Any thoughts?

cheers

niko
Reply With Quote
  #2  
Old 23-04-2013, 12:26 PM
Merlin66's Avatar
Merlin66 (Ken)
Spectroscopy Wizard

Merlin66 is offline
 
Join Date: Oct 2005
Location: St Leonards, Vic
Posts: 6,968
Hmmmm
Sounds a bit strange...
I use my powermates with the T thread adaptors ( the 1.25" section unscrews...) this brings the camera/ CCD very close to the rear of the body.
As the focus is (almost) independent of the back focus I can only assume you're not getting the front lens far enough into the light path??
Does the DSLR body focus at prime focus OK? How much "spare" travel does it allow?
Can you focus any of them with a low powered eyepiece?
Reply With Quote
  #3  
Old 23-04-2013, 12:58 PM
naskies's Avatar
naskies (Dave)
Registered User

naskies is offline
 
Join Date: Jul 2011
Location: Brisbane
Posts: 1,865
Perhaps you need more "out" focus - my 5x PowerMate usually sits at a similar focus distance as my eyepieces, i.e. about 5 cm further out than prime focus position without the PowerMate. Do you have a 2" diagonal that you could use as an extension tube?
Reply With Quote
  #4  
Old 23-04-2013, 04:20 PM
niko's Avatar
niko
Registered User

niko is offline
 
Join Date: Feb 2007
Location: Melbourne, Victoria
Posts: 1,053
thanks guys

I have a short and a long extension tube - maybe I just haven't got it all in the right combination

I suspect I need some daylight and a distant object to muck around and get it right.

cheers

niko
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 02:55 PM.

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