Light transmission describes the percentage of available light that passes through your binoculars. The amount of light can be increased with the use of anti-reflective coatings on binocular lenses. When an anti-reflective coating is applied to the glass surface of a binocular it increases the amount of light that reaches your eye. The coatings themselves are thin layers of chemicals applied to the glass surfaces of the binoculars. Coating quality is affected by the number of coatings and whether all binocular lenses, inside and out, are coated with several layers of coatings. Ideally, you should purchase binoculars that are fully multi-coated, which means both sides of every binocular lens are coated with at least several layers of the anti-reflective chemical. High quality lens coatings will appear as fairly light, subtle shades of blue, green or violet. A word of caution, beware of a binocular using heavily colored lenses. These lenses will only cut down on light transmission through the binocular. ________________________________________________________ We are only satisfied with your purchase if you are. Don't get stuck with a credit you don't want - read about our money-back guarantee. Eagle Optics.ca is an Authorized Canadian dealer of: Audubon, Bushnell, Eagle Optics, Leica, Masterpiece Collection, Nikon, Pentax, Radian Tripods, Stokes Birding Series, Swarovski, Vortex Phone Center hours (EST): Mon, Tues, Thurs & Fri 10-5, Wed 10-3 If you have any questions or comments, please do not hesitate to contact us at 1-800-710-4185. We would love to hear from you! You could also e-mail us at eagleoptics@sympatico.ca or fax to 519-826-7982 Eagle Optics.ca 951 Gordon St. Unit #3 Guelph, Ontario N1G 4S1 (Our retail location is open M-F 10-6, Sat 10-5, Sun 12-4. We share space with Wild Birds Unlimited, at 951 Gordon St. [at Kortright], Guelph, Ontario). Have you found our site from the United States? Click here to visit Eagle Optics USA