Jump to content

  •  

CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.

Photo

2" Focus Tube Extender

  • Please log in to reply
6 replies to this topic

#1 patindaytona

patindaytona

    Messenger

  • -----
  • topic starter
  • Posts: 471
  • Joined: 09 Aug 2019

Posted 23 August 2019 - 08:08 AM

2" Tele-extender.   How does this work? The narrower end is 2", right?

It that end fits into the focuser, then wouldn't the other end appearing wider be too wide for a 2" eye piece?

 

Can i also use this to fit the 1.25" adapter into it for the 1.25" eye pieces?



#2 S.Boerner

S.Boerner

    Apollo

  • *****
  • Posts: 1163
  • Joined: 29 Apr 2010
  • Loc: Chesterfield, MO

Posted 23 August 2019 - 08:16 AM

Look at the picture here and you'll see how it works:

     https://agenaastro.c...n-x2c-0008.html

 

You can put a 2" to 1.25" adapter into the extension tube for 1.25" eyepieces.

     https://agenaastro.c...r-acf-2125.html



#3 RAKing

RAKing

    Cosmos

  • *****
  • Posts: 8555
  • Joined: 28 Dec 2007
  • Loc: West of the D.C. Nebula

Posted 23 August 2019 - 08:18 AM

If you are asking about the 2-inch Televue extension, it was designed to fit in front of the diagonal or eyepiece.  The front end goes into the focuser and the back end allows a 2-inch eyepiece (or star diagonal) to be fitted. 

 

Yes, you could also put a 1.25" adapter into the back for smaller eyepieces.

 

Cheers,

 

Ron



#4 wrvond

wrvond

    Surveyor 1

  • *****
  • Posts: 1585
  • Joined: 25 Sep 2014
  • Loc: West Virginia

Posted 23 August 2019 - 08:22 AM

The outside diameter of the extender is going to be the same as your focuser tube.

In this picture the part with the gold label is the extender:

 

IMG 1872


#5 patindaytona

patindaytona

    Messenger

  • -----
  • topic starter
  • Posts: 471
  • Joined: 09 Aug 2019

Posted 23 August 2019 - 09:04 AM

Thanks, I kind of get it. The part that goes into the focus tube is 2" wide just like an eye piece is, right?

And even though the wider end of the extension appears wider than 2",  the "inside diameter" is still 2", is that it?



#6 zxx

zxx

    Viking 1

  • -----
  • Posts: 969
  • Joined: 27 Jan 2010

Posted 23 August 2019 - 09:27 AM

I can remove the lens from my 2" barlow and have a 2" extension



#7 S.Boerner

S.Boerner

    Apollo

  • *****
  • Posts: 1163
  • Joined: 29 Apr 2010
  • Loc: Chesterfield, MO

Posted 23 August 2019 - 10:03 AM

Thanks, I kind of get it. The part that goes into the focus tube is 2" wide just like an eye piece is, right?

And even though the wider end of the extension appears wider than 2",  the "inside diameter" is still 2", is that it?

Yes, that is correct.




CNers have asked about a donation box for Cloudy Nights over the years, so here you go. Donation is not required by any means, so please enjoy your stay.


Recent Topics






Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics