I've compared the MM4 with a DiaScope85…
https://www.birdforum.net/showpost.php?p=3695460&postcount=53
The MM4 is bigger than the Nikon and needs a sturdier tripod, the Opticron tripod failed for me. In my opinion the MM4 is more 'seriously', the little 50 (I know the scope with the 13-40x) is better for long hikes.
good decision
Manfred
(MM4, v2, 2532S - for low light DiaScope85 on 3530)
https://www.birdforum.net/showpost.php?p=3695460&postcount=53
The MM4 is bigger than the Nikon and needs a sturdier tripod, the Opticron tripod failed for me. In my opinion the MM4 is more 'seriously', the little 50 (I know the scope with the 13-40x) is better for long hikes.
good decision
Manfred
(MM4, v2, 2532S - for low light DiaScope85 on 3530)