I've just done a major upgrade to my EP collection. My new premium EPs include:
- Tele Vue 31mm Nagle type 5
- Tele Vue 13mm Ethos 100
- Tele Vue 5mm Mager type 6
I've been seriously considering a 1.5X Barlow to fill in this missing focal lengths:
- 31 MM
- ~21 MM (31MM X1.5)
- 13 MM
- ~9 MM (13MM X 1.5)
- 5 MM
- ~3MM (5MM X 1.5) This is not really useful
This would let me sell my ES 18MM 82 degree EP that I never loved to help the wallet recover.
I'll be using these in two scopes
- Celestron C11 (11" f/10 focal length 2794MM)
- Star Master 20 (20" f/4.5 focal length 2286MM)
I have not found any other 1.5X 2" barlows. If you know of some, point me to them. The price is right and the other Wollensak items I bought performed well, but these Tele Vue EPs are in a whole new class.