Jump to content


Photo

APO 80 and focal reducers


  • Please log in to reply
5 replies to this topic

#1 akhnaton

akhnaton

    Advanced Member

  • Members
  • PipPipPip
  • 67 posts

Posted 01 February 2008 - 03:34 PM

Is it possible to use a f/3.3 on an APO 80 without getting a coma?
Ishak Benbanaste
Tekirdag - Turkey
LX200GPS - 14"

#2 Mark Sibole

Mark Sibole

    Advanced Member

  • Administrators
  • 2368 posts

Posted 01 February 2008 - 07:20 PM

The 3.3 focal reducer will coma.
There is a lot less coma if you use it with no extensions at all but coma is still evident.
You can use the 6.3 focal reducer with good results.

Regards

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#3 Dave

Dave

    Advanced Member

  • Members
  • PipPipPip
  • 106 posts

Posted 02 February 2008 - 07:22 AM

Mark,

How do you attach the 6.3 focal reducer to the APO 80?

#4 Mark Sibole

Mark Sibole

    Advanced Member

  • Administrators
  • 2368 posts

Posted 02 February 2008 - 08:03 AM

On mine I use the t ring adapters I received with the 3.3 reducer on the camera side.
On the scope side I used the sct to 2 inch adapter i recieved with the LX200R.
You will need the t ring adapter for either focal reducer to connect to the imager.
And the SCT to 2 inch adapter for the scope side of the reducer.

Regards

Mark
Mark Sibole
MTSO Observatory
Fife Lake, Mi.

http://astronomy.qteaser.com

#5 Dave

Dave

    Advanced Member

  • Members
  • PipPipPip
  • 106 posts

Posted 02 February 2008 - 08:13 AM

Thanks Mark.

#6 ocsi

ocsi

    Newbie

  • Members
  • Pip
  • 1 posts

Posted 12 December 2008 - 01:48 PM

Hi,

I just bought a used Televue field flattener (TV-85) for little apo. I think this is needed for imaging. I took a picture about a subject without flattener http://osci.extra.hu...meade_test1.jpg  and with flattener too : http://osci.extra.hu...0/flattener.jpg . You can see the difference int the left side of the brick . In the first picture there is a blur part in the left side. But in the second picture the same place is nice. Therefore i think flattener is needed for correct imaging.

ocsi




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users