By adjustable, we mean the objective lens can be focused, which not only allows for a clearer target image but, as a by-product, also reduces or eliminates completely any parallax. (Other concerns about parallax will be addressed later in this chapter.)
Some scopes with adjustable focus use a ring on the objective lens. Most modern sniperscopes, however, put this adjustment in a knob on the left side of the scope, opposite the windage knob. Having used both types, I think the side-mounted knob is a bit better because it's easier to reach while you are lying in your sniper hide, but both styles work adequately.
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Deer hunting is an interesting thing that reminds you of those golden old ages of 19th centuries, where a handsome hunk well equipped with all hunting material rides on horse searching for his target animal either for the purpose of displaying his masculine powers or for enticing and wooing his lady love.