Firstly go to the source for best information and advice.
See
http://televue.com/engine/TV3b_page.asp?ID=2
and
http://televue.com/engine/TV3b_page.asp?id=154
and in particular
http://televue.com/engine/TV3b_page....n=Advice&id=78
Secondly Televue also make and sell short refractors and they would not make eyepieces that did not work well in their own 'scopes.
I am yet to find a telescope that a Tele Vue eyepiece did not work well in. All are tested to f4 and all eyepieces in their range are of very high quality. The different types have different characteristics including focal length, apparent field of view and eye relief.
Tele Vue are very helpful over the phone and if you call them you may even get Al Nagler himself answering.
Authorised Australian dealer is Bintel. See
https://www.bintel.com.au/product-ca...v=6cc98ba2045f and their sales and after sales service is first class when it comes to Tele Vue.