In my experience, a decent refractor just does what it needs to do, without drama. There's no mirror to collimate, no mirror to flop. Once the imaging train is dialed in, you let it cool for a bit, you focus, you take pictures. It just works. I confess to missing a reflector's diffraction spikes, but the unobtrusiveness of a decent refractor is almost luxurious given everything that can go sideways with astro-imaging.
jjav|2 years ago