Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

Recommended Posts


I own a Vixen ED-80 refractor which is used with a custom focuser by Telescope Service.

(pictured below)

A Celestron f/6 SCT reducer corrector did not provide decent images either because it is not appropriate or because I did not maintain the correct distance. 

I am thinking of buying the Sky-Watcher .85x Reducer/Flattener instead, as it is made for similar ED80 telescopes. 

I do not know what is the correct distance of the SkyWatcher reducer for my setup and more important, I do not know if it will focus with the custom TS focuser.

Do you have any similar setup that you have used successfully?

Clear Skies!



Share this post

Link to post
Share on other sites

Hi @Stardweller,

From what I have read, I believe you have just answered your question.

The SCT is a catadioptric and the field flattener/focal reducer, (FF/FR), is purely meant for those made by Celestron, Meade and other brands. I have used mine on my 're-modded' Meade ETX105, (see below), purely as an extension when using the Crayford focusser. Without it the focus wheel/knob of the ETX gets in the way of the locking collar and I am unable to attach it. I can attach the diagonal without it.

PIC023.JPG.9015768a3cb121416d49ca9a58c896aa.JPG<--- My ETX105 with Celestron FF/FR and Crayford focusser...

PIC022.JPG.ad2dde5173f39613817eb9f4f768708c.JPG<--- with a 2" star diagonal...

PIC021.JPG.317e3ab5bc2a32848d576782c9caf3ab.JPG<--- and without the FF/FR.

I do have an SCT threaded skylight [#1A] filter which does give me enough space and slightly reduced weight to fit the Crayford focusser without the stock focus wheel/knob getting in the way. That said, I am still looking for a lighter weight extension ring.  

Edited by Philip R

Share this post

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

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.