>>2662570Cheap way to get beyond 300mm, if you have some form of guiding already. They tend to be a bit slow (f/8 - and t/11 - is common) though, and I know from experience that that Pentax GPS doohickey is about at its limits at 300mm (crop, so 450 equivalent) It'll track for 30 or 45 seconds if you do the precise calibration at that focal length, but getting a minute or more out of it without star trailing is a challenge. If you can't afford a nice equatorial mount and a nice telescope to put on it, get the nice mount and a lens like that. You can get nice results with a good EQ mount and ordinary camera lenses, you're just limited to larger objects and wide-field stuff. With a bad mount you won't get nice results from anything.
incidentally I also have the cheap Chinese right-angle eyepiece that that K5 has on it. The 2x magnification feature is useless, since it changes focus and eats way too much light. Wobbles a bit, gotta be careful not to press up against it. But it's adequate and sure was cheap.
