WO Zenithstar 66 visual back

[Cleetus]

I have a WO Zenithsrar 66 with a threaded visual back for a 2 inch diagonal. Does anyone know if, instead of using this particular diagonal, there is a suitable adapter which screws on to this thread and will allow the use of "refractor type" diagonals instead? A Baader clicklock would be useful if one exists.

[johninderby]

The “visual  back” isn’t for 2” diagonals but for other accessories. The scope won’t focus properly with a 2” push fit diagonal. You need an SCT type 2” diagonal.

Edited April 23, 2020 by johninderby

[Cleetus]

Thanks. I have an old 2" diagonal attached at the moment but I have a much better 2" diagonal without the threads and was hoping to make use of it. From what you say I take it that won't work? Seems odd.

[johninderby]

Depending on the brand of diagonal you may be able to get an SCT nosepiece for it.

The 2” visual back is mainly for use with a camera. 

Edited April 23, 2020 by johninderby

[Cleetus]

I think either I didn't explain properly or you misunderstood. 2" diagonals with SCT threads (SCT diagonals) are quite common. So, as you know, the WO Zenithstar I have already has one of these diagonals. It is also WO - so the telescope was also designed for visual use (the graphic you posted shows this) and many used this combo for a "super" finder.

What I was asking was if there was an adapter available which screws on the end of the telescope and would allow use of 'normal' diagonals.

I have a Tak with a Baader adapter (M72) screwed on the end which enables me to use diagonals and I was thinking about something similar. Why do you think reaching focus would be an issue?

Edited April 23, 2020 by Cleetus

[johninderby]

21 minutes ago, Cleetus said:

I

What I was asking was if there was an adapter available which screws on the end of the telescope and would allow use of 'normal' diagonals.

 

Yes you could fit an SCT visual back but you can’t use a 2” push fit diagonal in it due to the increased focal length of the diagonal and nosepiece and most eyepieces won’t focus due to the lack of infocus.

Edited April 23, 2020 by johninderby

[Cleetus]

I understand.  Hadn't realised there would be such a difference.  Thanks for posting.