Description
- 55mm back focus
- M48 threads (not standard T-thread)
- Drops Evostar 100 from f/9 to f/7.56
Note: The length of the threads on the reducer/corrector are too long for the ZWO OAGs and cannot be threaded all the way in without changes such as a threaded ring added to consume some of the threads on the reducer, which can affect back focus. Alternately the reducer threads can be machined down.