On Sep 4, 2007, at 2:37 PM, Bob Blakely wrote: > Interesting. The chromatic aberration produced by the lens can > clearly be > seen. This would not have been evident if the moon were properly > exposed - > but then you wouldn't have recorded any of the sisters. > > For stars, nebulae, etc. (not the moon) at high magnification: > > The following requires a properly aligned equatorial mount with > sidereal > tracking, a ref converter with as much magnification as you can get > and the > entire night in a dark area. >
I have a nice alt-az mount, and live close to Washington DC. So, I chose the moon. Big and bright simplifies things. I'll stay with an unguided DSLR for now. I'm still new to astronomy, and need to learn to walk before running. The 7 Sisters came out better than I expected- they were an accident. The moon was the real target. It was the first frame of the night, and I didn't have much of a clue about the exposure. Cheers, Mike -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
