- Posts: 1
- Joined: Thu May 13, 2021 3:20 pm
- Real Name: Timo Strobel
An Ursa Broadcast is going to solve all of the B4 mount issues.
Inexpensive adapters are slow because they are designed to cover a larger image circle than 1". A 2x doubler costs two stops of light. The f1.7 b4 lens is now an f3.4 that's not going to sharpen up until f5.6 or f8.0. For exteriors this shouldn't present much of an issue, interiors are another story. A modest ISO of 400 at f5.6 requires 100 footcandles. This is basically followspot territory.
Good Luck