Tele Vue imaging methods: Prime focus, reducer, barlow…
https://www.televue.com/engine/TV3b_page.asp?id=85&plain=TRUE#Powermate
Steve Alan Johns MA: Information Systems – Avant-garde thinking – Astronomy – Ham Radio – Satellite – Investing
Steve Alan Johns MA: Information Systems – Avant-garde thinking – Astronomy – Ham Radio – Satellite – Investing
Tele Vue imaging methods: Prime focus, reducer, barlow…
https://www.televue.com/engine/TV3b_page.asp?id=85&plain=TRUE#Powermate