The LEICA ER riflescopes combine legendary optical performance with unsurpassed mechanical reliability. The ER 2.5-10x42 and 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 hunters rifle case or scabbard. Designed for ease of mounting, the ER series has the most compact eyepiece and 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 calibre rifles. The outer lenses are coated with Leica's high tech AquaDuraTM coating – whose water and dirt repelling properties make cleaning easy and keep lenses ready for action.