Another disadvantage of the windage and elevation knob design, is the typical placement of the knobs in the center of the scope.


The ocular lens group presents the second image to the eye for viewing.

In a typical scope, the erector lens group is part of an erector lens assembly, which includes a guide tube that carries the erector lenses.

It does this through the use of a series of lenses mounted within a generally tubular body and a combination of mechanisms to adjust lens positions.

The lenses in a scope can be generally divided into three groups: the objective lens group; the erector lens group; and the ocular (or eyepiece) lens group.

This problem is proportional to the caliber of the rifle to which the scope is attached.

For .50 caliber rifles, it tends to be impractical to provide a conventional magnifying scope with windage and elevation adjustment due to this problem.

The thin-walled cam tubes are quite delicate and can be easily bent during the manufacturing operation, thereby driving up the reject rate and the costs of manufacturing.

The thin-walled cam tubes also decrease the expected useful product life, because each time the rifle is fired the slot follower is jolted violently backwards in its cam slot, potentially damaging the thin-walled tube.

Depending on the particular design there may be one or more individual lenses in each group within a scope.

The erector lens group gets its name from its role in inverting the first intermediate image, which would appear inverted (ie.

Each erector lens mount has a slot follower that fits into the corresponding cam slot.

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