Focus problem with ASI120MC and Televue 2x barlow

Stuff you need to know.

Focus problem with ASI120MC and Televue 2x barlow

Postby rgarner » Tue Mar 08, 2016 5:19 pm

Scope: Orion 127mm Mak-Cass f/12.1
camera: ASI120MC
barlow: televue 2x

Imaging with the camera only - works great. I cannot achieve focus with the 2x barlow.
Do I need to purchase a shorter barlow..... or ( if possible ) do I need to modify the focus mechanism?
Please check out my image of Jupiter. Thx for your help. Rob
Attachments
3.5.16.jpg
Jupiter - not bad for a rookie : )
3.5.16.jpg (3.41 KiB) Viewed 2326 times
rgarner
 
Posts: 3
Joined: Fri Jan 24, 2014 8:45 pm

Re: Focus problem with ASI120MC and Televue 2x barlow

Postby Sam » Wed Mar 16, 2016 1:48 pm

can you reach focus with eyepiece + 2x barlow?
ZWO Founder
Location:lon=120.6 lat=31.3
SuZhou China
User avatar
Sam
 
Posts: 2548
Joined: Thu Feb 21, 2013 2:51 am

Re: Focus problem with ASI120MC and Televue 2x barlow

Postby rgarner » Fri Mar 25, 2016 2:46 am

Yes. Focus with Eyepiece + 2x barlow is good. The Televue barlow may be too long. I have ordered a Celestron 2x X-cel barlow (shorter). I will post if it works. Thanks for the reply.
rgarner
 
Posts: 3
Joined: Fri Jan 24, 2014 8:45 pm

Re: Focus problem with ASI120MC and Televue 2x barlow

Postby tibbe » Tue Jun 21, 2016 11:24 am

I can reach focus with my Tele Vue PowerMate 2.5x, which is quite long, and my ASI224MC in my NexStar 8SE. Takes quite a few turns to the right of the focusing knob though. Can you reach focus with your barlow and eyepiece without using the star diagonal, assuming you don't use that when imaging?
tibbe
 
Posts: 4
Joined: Wed Jun 08, 2016 11:23 am


Return to Announcements

Who is online

Users browsing this forum: No registered users and 1 guest