Quote:
Originally Posted by Terry B
I find it amazing that you would need a 15 sec exposure to guide. With my 200mm scope and the guide chip on my ST10 I can guide at 2 secs on a mag 12 star through a green filter. Maybe 4 secs using a blue filter.
Guiding with my spectrograph on a C11 using an STi guider I will always have a star to guide on with a 3 sec exposure and mostly I can use 0.5 sec if I want to.
I use my AO sometimes with my NJP mount but only if I want particularly tight stars with a dim target star in a crouded field. It certainly will achieve this better than regular guiding even with my reasonably good quality mount. For my normal targets of variable stars or spectra this is not usually a requirement. Pretty pic imaging is a bit different though.
|
There is often a guide star allowing exposures shorter than 2s, but there's also often not
Most of my preferred targets are galaxies which tend to exist away from the dense star regions of the Milky Way and I find the FOV of the guider on my ST8-XME often won't have a star shown in TheSkyX and also in reality when I do a 5s exposure. So getting a minimum of 700ADU on a star for guiding can be a challenge.
