Swarovski Z6i 2,5-15 x 56 P SR 4A-I

The adjustment range describes the range within which you can correct the impact point by adjusting the reticle without moving the device. The adjustment range is specified in relation to both the elevation and the windage adjustment.

Swarovski measures the adjustment range in meters per 100 meters (m/100m) or inches per 100 yards (in/100yd). Other manufacturers choose to specify this in MRAD (milliradians) or MOA (minutes of angle).

This describes the amount of visible light that can pass through an optical system and is expressed as a percentage. The objective lens diameter specifies how much light can enter the optics. This makes it a key factor in an instrument’s performance, for example, in twilight. The bigger the objective lens diameter, the more light the objective lens can capture. The darker the surroundings, the larger the objective lens diameter needs to be. Check the precise product name as the number after the ‘x’ specifies the objective lens diameter in millimeters. A device with a suffix of 2-16×50, for example, has an objective lens with a diameter of 50 mm.