I'm new to this stuff myself - but I'm personally going on the logic that pretty much anything longish in focal length say 14"+ that is around f4.5 should cover easily, especially when focused closer ...

I expect to be corrected however by someone more knowledgeable in due course

Avoiding Aero-Ektars is something I've noted from reading up - although fast and apparently cheap the glass due to its composition soaks up your precious UV...