I currently have a 135mm f/2 Samyang and a RASA8 is always a tempting thought at the back of my mind.
I have a dual band filter for my 533MC-Pro, an IDAS NBZ-II. The IDAS NBZ-II seemed like the logical solution for me since it’s tighter than my prior filters (NBZ-I and, earlier, L-Enhance) but still works on face-peeling, screaming-fast systems. And for budgetary reasons, a single-filter option that works on my 135mm f/2 lens and my f/4.8 AT60 (w/0.8x) and f/5.4 NP101 seemed the best option.
But if I decided to go the route of an L-Ultimate (or similar) for my refractors and an even tighter filter for f/2, what’s the tightest f/2 filter option out there for OSC?
Clear Skies,
Phil