Quote:
Originally Posted by Ausrock
Philip,
What was your reasoning for using an OAG rather than a guidescope?
I'm sitting here not far from John Hunter with a C9.25, EQ6, QHY-5, 40D, etc., just trying to figure out which way to go for guiding  .........of course, while we have this stupid weather I'm not going to have much chance of attempting imaging anyway  . I'll probably have questions about your setup later on.
Cheers,
Chris |
Hi Chris ,
There were two reasons i chose off axis guiding , the most important of which was the small size of the opening in my observatory which meant both scopes would not necessarily be able to look through parts of the opening at the same time. secondly off axis guiding removes the problems of possible flexure between guide scope and imaging scope. only drawback seems to be finding guidestars in a more limited field of view. i have used both forms of guiding with my ED80 and had no problems but with the longer focal length of the C9.25 with focal reducer i suspect they would become obvious.
regards philip