RE: Shooting specs The main models available are the 3 varients from Champion; World 1, World2 & Olympic. The opposition is Knoblock. Having tried them all the Champions seem to be the best as they are rigid*, stable, comfortable and have a large range of extras. The Knoblocks are quite good also but are not quite so rigid. The basic Champion World 1 is excellent and does not suffer from the possible weak points* of it's more expensive stablemate, the Olympic.World 2 is World 1 with an adjustable bridge and is also very stable. There are other types; Eastern European copies which are heavier and not so well put together, head band lens holders, spectacle types (Junkers) but all are second best.