I use a 52-48 step down ring to mount 2” astro filters to the front of my DSLR lenses. Then I use a step down ring specific to the lens objective to get it to 52mm. Works fine. The couple filters I have are both m48x.75, same pitch as most lens filter threads. The back of the AT60ED is also threaded for an m48x.75 filter thread, so it should work fine with that as well.
Which specific filter are you looking at getting? Mine are optolong, and both have this thread size.
Thanks. I'm thinking hydrogen and oxygen. Don't really know which specific ones. It'll be for unmodded cameras for now.
Didn't think about the AT60ED, I can put it ahead of the flat field corrector and maintain my sensor distance.
The nice thing about the adapter is that the filter closer to the m4/3 sensor.
Edited by vidrazor, 14 November 2019 - 09:49 PM.