Originally Posted by pete_gamby
And then to add more to the list for consideration we just added an MM3 50 non-ED to the MM range :-)
(which is waterproof) and has some features not found on the 501 such as rotating tripod ring, full rubber armour, interchangeable eyepieces etc.
Street price with HR2 zoom is around £249.
Wow, that's an amazingly large price difference between the MM3 non-ED and the MM4 ED. Makes one wonder whether there are differences in manufacturing tolerances/quality control on top of the difference in objective lens. For someone who already owns an appropriate ocular, it's practically free!