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.
Objective rifle scopes are expensive. 
( z1 expensive :domain ( z2 scope :mod ( z3 rifle ) :mod ( z4 objective ) ) )