1) zero ability.
2) waterproof and fog proof.
3) image clarity. I'd always take a better optical scope with lesser magnification over a optic that's got more magnification and lesser quality glass any day of the week.
4) scope is relative to the intended use. For instance don't put a 3-15 vx5 on a bush pig 308 when a 2-10 vx5 will suffice beautifully.
5) field of view.
That would be my top 5 so to speak.
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