You can search in the Jülich-forum
for my experience with the MM4-60. (Use the search form there) I've read, that you prefer the MM3, that's ok, but look for my advices for the tripod. If you have one use it, and make your own experience, which magnification range you prefer. My suggestion is, that 50mm is more restricted than 60mm, I'm watching also with a 85mm-DiaScope. The MM3 is discussed also in the binomania-site
, you can translate in English.