alt-az + accessories or gem?
Posted 02 February 2013 - 10:37 AM
I understand that alt-az goto mounts are fantastically convenient, and that the alt-az system will be much lighter (and, very possibly, more likely to get out and about). I suppose that when I move toward imaging I can get a wedge; but, will it be as good as a good equatorial mount?
Of course, I could always go cpc 1100 w/o accessories...
I'd appreciate hearing anyone weigh-in with the kind of choice they'd make . . . and why (understanding always that many of the reasons will be subjective!)
Posted 02 February 2013 - 10:50 AM
Alt/Az motions are intended for terrestrial viewing and are adapted to astronomical viewing however the motions are all wrong for astronomical tracking.
The GEM mount was developed for astronomical viewing and has the correct motions to compensate for the rotation of the earth relative to the position of Stars, DSO's, and other astronomical objects.
Attempting astroimaging with an Alt/Az mount can be done with short exposures and often reduced image quality however an accurate stable GEM mount allows you virtually unlimited exposure times when astroimaging, exposures times are only limited by sky conditions and light pollution provided the GEM mount is polar aligned accurately...
Posted 02 February 2013 - 11:17 AM
A GEM will certainly weigh more as a complete unit, but breaks down into manageable pieces. And a GEM will do a lot better when you get into AP.
Posted 02 February 2013 - 10:34 PM