|
I think the limiting factor is cost and location. Medium light polluted can still capture the brighter galaxies but the dimmer ones is really a dark site proposition.
Even with a dark site a lot of galaxies will require 6 hours minimum to image reasonably and ideally a lot more than that. That assumes a sensitive mono CCD astro camera and a reasonably fast F ratio and aperture. It then also becomes somewhat not portable and requires a permanent installation.
So you can see where remote imaging makes sense in order to get enough hours up into the image.
Nebula on the other hand can be captured anywhere, light pollution is not an issue with narrowband and small scopes can do very well.
So cost and time are less.
Some scopes are a compromise for doing either. Some refractors come with a range of reducers to do wider field nebulas and still do the brighter galaxies. They are within the bounds of portability as well.
If you have to travel to get dark enough skies to image then a fast scope with as large an aperture as you can afford makes a lot of sense.
Greg.
|