How to use adjustable objective rifle scopes<br>Be sure that your scope is mounted properly. Sighting-in can have been done preliminarily, but additional sighting-in will be desirable after following these steps : Know your rifle. There are actually two optical systems in a rifle scope.
A scope needs to have lens covers while moving. 
( z1 need :ARG0 ( z2 scope ) :ARG1 ( z3 cover :ARG1 ( z4 lens ) :time ( z5 move :ARG1 z2 ) ) )