I was able to add the 3" Explore Scientific Field Flattener/Reducer along to the ASI071 with the Explore Scientific ED80mm. That's around 50mm + 17.5mm if I'm not mistaken. I tried without using the FF and just M42 extension adapters to get close to 45mm backfocus, 55mm, and in between. No focus or proper visibility in daytime and nighttime. I tried the recommended arrangement from the ZWO ASI071 manual.
What magic combination worked for you Explore Scientific ED80mm owners who used it with ZWO cameras?
Edited by azastronomer, 17 September 2020 - 02:45 AM.