The compact 42 mm Duovid offers both 8x magnification, with a wide field of view and a shake-free image, as well as a 12x magnification, ideal for discerning additional detail. As with the 50 mm model, the patented eyepieces with two click stops provide optimum eye relief and can be adapted to the needs of the viewer. Changing magnification is done separately for both tubes by turning the two rings. Automatic Diopter Compensation (ADC^TM ), the diopter value you set is retained even when changing magnification.