True. Mostly has to do with focal ratio. Big f-ratio scopes are better for planetary observations, where small f-ratio scopes are better for wide-angle views. G

True. Mostly has to do with focal ratio. Big f-ratio scopes are better for planetary observations, where small f-ratio scopes are better for wide-angle views. Generally, Cassegrains fall into the first camp and Newtonians into the second. Refractors are somewhere in the middle. Regardless, more aperture is always better. :)