Now the problem. I quickly realised that there are som objects that I'd like to shoot that are quite small for the setup - e.g. 100 pixels on the camera. So I started looking around for either longer focal length telescopes or barlow. The main limitation I have now is that it must not weight more than say 10kg and have a bigger apperture than 8". During this search I did come across a interesting number called resolving capacity and found that mine actual telescope's 5.5 is quite a good one. From that I came to the conclusion that unless I would be willing to move to much bigger appertures there is no reason for having a different telescope this size since mine current equipment already reaches physical limit of a telescope of this class and I could not get any more detail from it.
Is this conclusion correct or am I missing something?