I'm using Baader high speed filters which are optimised for f3 so not really an issue on terms of transmission. The major issue with the DR350 is, however, tilt. The critical focus zone is only 12 microns so pretty much every time I move the rotator then I have to dial the tilt correction back in.
I can do it reasonably quickly now after quite a few initial teething troubles but I really don't know how you would ever deal with this on a remote installation, for example. Its a pretty 'high maintenance' bit of kit
