LEICA ER riflescopes combine legendary optical performance with unsurpassed mechanical reliability. The Leica ER 2.5-10x42 and Leica ER 3.5-10x42's moderate size is ideal for hunting rifles used in rugged conditions – backpack, horse-back, fly-in hunting camps. The LEICA ER fits perfectly in the hunter’s rifle case or scabbard. Designed for ease of mounting, the Leica ER series has the most compact eyepiece and the largest amount of straight tube fore and aft of the turret housing of any premium riflescope. The long eye relief (10 cm) is ideal for large caliber rifles. The outer lenses are coated with Leica's high tech AquaDura coating – whose water and dirt repelling properties make cleaning easy and keeping your rifle ready for action.