Q1: how is the optic quality of this scope compared to the older version tried and tusted straight body spacemaster? Why the multiposition is more versetile yet much cheaper?

A: The optical quality is still good but the body is not as durable as the older version so you would need to be a bit more careful with this one, overall though it is very comparable to the original.

Q2: Pls tell me what the 10x50 measurement means on my Bushnell Legacy binoculars

A: Binoculars are designated according to the amount of magnification they produce and the diameter of their objective lenses. Bushnell Legacy 10x50 binoculars produce 10X magnification and have 50mm objective lenses.

Q3: Are the lenses glass or plastic?

A: The Bushnell SpaceMaster spotting scope has glass lenses.