Michelle Stone (michellestone@No-Spam) said:
>The problem with equatorial tables is that the two axis are not orthogonal.
>So you are going to have a tough time with guiding. Additionaly, with CCD
>shots, you'll want to shoot the object of interest for 3 or 4 hours, so
>pushing the table back, reaquiring the object, and resuming your shooting
>can be a pain.
What about the images shown on Tom Osypowski's EQ platform page:
http://www.equatorialplatforms.com/images.html
Many of these are done with larger Dobs on dual-axis platforms, typically
stacking multiple shorter images.
>You should consider the objects that you are going to photograph before
>purchasing a large scope and mount. The most interesting objects are most
>easily photographed with instruments in the 4" to 14" aperture and 900 to
>1300 mm focal length ranges.
Ray Gralak is getting some beautiful results (locally) with an 18"
equatorially mounted Newtonian, focal length 2058mm.
Mark