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.

sgl_imaging_challenge_banner_dslr_mirrorlesss_winners.thumb.jpg.9deb4a8db27e7485a7bb99d98667c94e.jpg

Recommended Posts

Share this post


Link to post
Share on other sites

Probably be better off with a Crayford design that one appears to be limited to 1.25 eyepieces and it's sometimes useful to use 2" eyepieces in SCTs depending on the size of the scope.

Dave

Share this post


Link to post
Share on other sites

Do you mean a Skywatcher Mak?

Anyway that helical focuser isn’t very good if used horizontaly. Much better if used vertically in the top of a diagonal.

This Baader prism diagonal has a micro focuser on the top.

https://www.rothervalleyoptics.co.uk/baader-prism-diagonal-t-2-90-with-focusing-eyepiece-holder-and-125-nosepiece.html

Share this post


Link to post
Share on other sites

U can get the Crawford focuser for sct types but it's pretty bulky and big if u got the fork mark scts, and by time u put 2 "diagonal it may bump the base.

Best bet is get the feather touch micro focuser. It replaces the oringinal with a dual speed. Every size and model sct has a specific model that will fit.

It's easy to install costs about 250 USA but worth it instead of doing a big bukly rear sct Crawford

Look it up and u will see 

Joejaguar 

Share this post


Link to post
Share on other sites

Hi

Thanks for the reply’s. I had looked at the featherlight ones but they are out of my price range, the Crawford ones are only just in it. As I’m still very much learning, would the helical one work on my 127 without having to buy any other parts as it’s only £25. Then once I’m a bit more accomplished upgrade to one of the better focusers.

 

thanks

 

Jack

Share this post


Link to post
Share on other sites

The problem with this cheap one is that it rotates as you focus which means that it has to go on the top of the diagonal which is a problem if your diagonal doesn't’ have  a T2  thread on the top. If it doesn’t you would need to buy a T2 to 1.25” nosepiece to allow the focuser to fit into your diagonal.The eyepiece will rotate as you focus. 

You would need a non-rotating helical focuser if you wanted to fit it between the scope and the diagonal.  Having the diagonal rotate as you focus just wouldn’t work

Something like this. Lot more expensive though.

https://www.ebay.co.uk/itm/ZWO-1-25-Helical-Focuser-with-T2-Connection-non-rotating-System-ZWO-HF1-25/372784265184?hash=item56cbac77e0:g:lDIAAOSwKRJdjGuA

Share this post


Link to post
Share on other sites

I successfully use the Borg Helical focusers on all the Spectra-L200 spectrographs as well as the Spectroheliograph and PST Mods.

 

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

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