AT10RCF, TMB SV105 F6.2, C11, Obs 15, DS solarmax 40 AP900GTO QSI 683 & 640wsg-8 12' X 15'6" BYO http://www.astrobin.com/users/jaddbd/
Quote:If the users in this group can't, or refuse to, acknowledge the effects RA-DEC orthogonality has on the ability to polar align and ultimately its effects on tracking then I'm definitely in the wrong place.
Uncle Rod Uncle Rod's Astroblog: http://uncle-rods.blogspot.com/
Ed Thomas Deep Space Products www.deepspaceproducts.com
Quote: Also (responding to some banter earlier in the thread), my experience in thinking that you can just point and shoot a high end mount “unguided” is a bit of a misnomer. Even if you have excellent polar alignment, and very little periodic error, you still have to account for the fact that objects in different parts of the sky move at different rates due to refraction, and that rate may change position of the said object changes. There are software tools provided to adjust for this, but it is way easier and more accurate just to guide IMHO.John DMaryland
Tak AP QSI Canon