Quote:
Originally Posted by skwinty
Hi Scott
It is my understanding that the guide scope does not have to be aligned to the imaging scope. It could for example be 30 degrees off the main scope axis. (to find a suitable guide star). If your mount is accurately polar aligned , then the guide corrections would only be in RA and not DEC. If however, you are not accurately polar aligned the your guide corrections would be RA and DEC which is not so good as there are corrections in two different axes.
This is my understanding and if I am wrong please correct me.  |
This was my understanding as well, as i thought i had heard that the benefit of using a guidescope over a off-axis guider was that if there was no suitable star in your field, you could just find one with your guidescope....
Then i started thinking about the cone-error correction, and what guidescope rings are actually for and if my guide scopes cone error would cause field rotation as it over corrected in the guide scope.....
Im very confused...
(which, as you may a;ready know, isnt all that hard)