Quote:
Originally Posted by bert
I think you guys maybe looking at guiding from the wrong perspective. Good guiding is good guiding at any focal length. Bad guiding can sometimes be hidden by imaging at a shorter focal length, so why not just go for good guiding?
|
I'm with Brett on this one - angular guiding errors are independent of imager focal length, so they just need to be good enough to hide below the seeing.
for example, 3.75 micron guide pixels (ASI120/QHY5L2) with a 180mm fl guidescope yield 4 arcsec pixels. With 10x sub pixel resolution in the guide software you can resolve 0.4 arcsec errors, which with 2 arc sec seeing and a good mount, should keep stars within about 10% of the seeing limited FWHM with any imaging system.