|
I mainly use 3 eyepieces, a 21mm for open clusters and large nebulae, a 13mm for small nebulae, globular clusters and galaxies and an 8mm for planetary nebulae. The powers and fields with the 12" dob are 21mm=71x=33', 13mm=115x=20' and 8mm=188x=12'. A UHC filter is great for nebulae. A 16" should show almost all of the southern NGC objects, they were discovered by John Herschel with an 18.5" scope that is equivalent to a modern 16.5".
|