Quote:
Originally Posted by [1ponders]
Yep even with an OAG you will get field rotation. It is the nature of the alt/az beast. You have two choices, a field derotator (which I wouldn't recommend with a 300D unless you like hearing the sound of crunching camera as it tries to pass through the forks.) or an equatorial wedge.
I'd go for a wedge, or better yet, get an equatorial mount.  |
Hi 1Ponders,
Thanks for your reply, it is very hard to know what to do for a beginner.
(1) I have a Nexstar 11 and just checked it with the camera mounted in the diagonal and i have about 4 inches clearance. So, I like the idea of a field de-rotator but they are expensive and i am not sure of the accuracy of my drive system.
Still i would like to investigate them, can you recomend one for a Nexstar 11?
(2) I can get a wedge, but am not sure if i have the ability to 99.9% polar align it. Especially in sydney where it is hard to get a clear view of the horizon (Inner Sydney). So I have a question. If i nearly Polar align it will i be able to increase the exposure time from a minute, or is 'nearly' polar aligned totally useless and the same as Alt/Az mount?
Thanks Paul