Better glass coatings/ glass. full life time wty, (Z3 is limited lifetime ten years I think) lower power, the 3x18 is 44 mm I would have thought that, rather than a 50 as then wouldn't need to grind new lenz, as the 5x25 is 52mm, hopefully swarvoski expand the Z5 line up further 2x10x44 would suit a lot of application's.
I find a very noticeable difference, between my Z3 and Z5 scopes in low light.
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