I agree with Steve here on the Fieldscope eyepieces, I have the same setup with the FS III and it came with the 20-45 Zoom eyepiece. I also obtained the MC II 20-60 Zoom, and I do prefer it, it seems a bit brighter and the FOV seems wider at various places. One difference may be it is fully multicoated, and I am not sure about the other.
I like the FS III, 60mm (non-ed) and with this lens I am happy. I do not spend as much time using the scope as bins, so for me this scope works well.
Jerry :t: