[glend (Glen)]

So what are the pros and cons of widefield equipment for DSLR imaging? Reading other threads seems to indicate that lenses can suffer from distortion, coma, and in some cases colour dispersion; where as they offer variable focal length and f stop within a single device. Widefield scopes (APO) seem to offer superior optics at least in terms of distortion, coma, and colour control, but usually have a fixed focal length.
Ultra wide field seems to be the domain of specialist lenses and are outside the scope of this question.

What do you use and why?