I finally purchased the extender for my FSQ-85, which wil make it almost f/8. Whilst not particularly long, it'll certainly be deeper than f/5.3
Any tips for imaging at the longer FL's? I have ZERO issues guiding at f/5.3 (flatline for all intents and purposes, yes, even in Arcsec...
). I usually guide with 3 sec exposures, and generally between 10 and 20 min per sub unfiltered - would going shorter exposure limit any discernible elongation if present in the longer FL runs?
My intention is PN's as they really are my "thing" (might have to go even longer), and I will be using an Optolong L-extreme filter on an OSC. 85mm may not be ideal for deeper imaging, but nothing ventured, nothing gained (plus with the extender, at least planet and lunar visual observing is more favourable)