Jump to content


Reducer for a short focus (420mm) APO?

Recommended Posts

Recently, I bought a 2" Astrophysics 0.67 Reducer for another scope which got sent back. I kept the 0.67 reducer for sometime in the future. While waiting for the future I was playing with my TS65EQ 420mm f6.5 scope as ya do! I placed the reducer on the front of the ATIK 3 nosepiece and slid it into the scope then wondered if I could find focus. Well, blow me down, I did :) And I was impressed I could now fit objects in the FOV that would have needed a mosaic before.

On closer inspection, I noticed the corners of the image were not that great compared to the perfect flat image of the TS65EQ without any additional optics. 

The TS65EQ already has a field flattener built in. 

My question is, are there any focal reducers out there for such a short focal length scope? The ones I can find are for SCT's not APO's.

Unprocessed Trunk.


Trunk wide field.JPG

Corner edge

Trunk corners distroted.JPG


Trunk from basic TS65EQ no crop.


IC 1396 Elephants Trunk HOO.jpg

Edited by Star101
Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.