Weighing only 1.55 lbs, Opteka Telephoto Mirror Lens is a 500-1000 mm f/6.3 lens for use with Canon cameras. Users of the Opteka camera lens for Canon should note that its design incorporates specially designed coatings on the various lenses to provide a user with vibrant image capabilities and reduce flares and ghosting. This telephoto Opteka camera lens for Canon is capable of focusing on objects as close as 6.6 feet, and it is meant for distance photography, such as in nature shots. The seven elements in this Opteka camera lens for Canon are divided among six groups. When being adjusted during use, the maximum diameter supported by this Opteka Telephoto Mirror lens is around 1.65 inches. The angle of view for this 500-1000 mm f/6.3 lens is 4.1 degrees wide by 2.7 degrees high to give photographers a range of room to work with. This is a manual focus lens that accepts 95 mm filters. This Opteka camera lens for Canon weighs 24.9 oz, and it has a length of 4.7 inches and a diameter of 3.86 inches.