So you don't have to plaster your eye to the viewfinder to line up your scope. All lenses are fully coated for maximum light transmission. It has 50mm achromat objective and a 26mm 6 element composite eyepiece. This uses a red laser light fiber optic illuminator to illuminate the crosshairs, so that on a very dark backdrop you will see see the crosshairs and be able to line up your scope. Rotating actuator switch for hands free operating.
Light intensity is adjustable.
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