Optional Nikon eyepiece diopters allow you to optimize your SLR viewfinder's sharpness in conjunction with your individual eyesight.Eyepiece diopters are designed for specific camera models and are identified by a plus, a minus or a neutral numeric diopter value. . Standard eyepieces supplied with Nikon SLR cameras have no corrective value and are for dust protection only. Select eyepieces are supplied with a rubber coating designed to lessen scratching of a photographer's eyeglasses. . Nikon SLR cameras (without built-in adjustable eyepiece correction) have a base diopter value of minus one. This is why you won't find an accessory Nikon eyepiece diopter valued at minus one. Minus one is considered the optimum starting point for the majority ofSLR users with normal vision. . The combination of the camera's viewfinder components and a clear (standard) eyepiece form a virtual image of a subject on the camera's focusing screen that is the approximate equivalent of a viewing distance of one meter. . Each Nikon eyepiece diopter incorporates a numerical value, represented by a minus value (nearsighted) or a plus value (farsighted) number, enabling you to select the appropriate diopter for your vision and your camera model. . The eyepiece's diopter value is, when combined with the viewfinder's minus one value, the end-result value. No combination of the camera's base value of minus one and a given accessory diopter's value is required to arriv FROM THE MANUFACTURER The Nikon -4.0 Correction Eyepiece is an optional Nikon eyepiece diopter that allows you to optimize your SLR viewfinder's sharpness in conjunction with your individual eyesight. Nikon SLR cameras (without built-in adjustable eyepiece correction) have a base diopter value of minus one. Minus one is considered the optimum starting point for the majority of SLR users with normal vision. The combination of the camera's viewfinder components and a clear (standard) eyepiece form a virtual image of a subject on the camera's focusing screen that is the approximate equivalent of a viewing distance of one meter. Each Nikon eyepiece diopter incorporates a numerical value, represented by a minus value (nearsighted) or a plus value (farsighted) number, enabling you to select the appropriate diopter for your vision and your camera model. The eyepiece's diopter value is, when combined with the viewfinder's minus one value, the end-result value. No combination of the camera's base value of minus one and a given accessory diopter's value is required to arrive at the final desired value. In other words, if you require a diopter of plus 3, simply add a plus 3 diopter to your camera. To determine which Nikon diopter value is best suited for you, visit your ophthalmologist, optometrist or dispensing optician. Ask them to determine your diopter from (your corrective prescription) when viewing an object at distance of approximately one meter. Base your selection on this diopter value. This eyepiece is compatible with the Nikon D50, D70, D100, N50, N60, N65, N70, N80, N6006, Pronea, and FM10 cameras.

For Nikon D50, D70, D100, N50, N60, N65, N70, N80, N6006, Pronea, FM10 cameras. Compensates for nearsightedness. Provides a -4.0 diopter value. Optimizes your SLR viewfinder's sharpness to your eyesight.

Water Resistance Level: Not Water Resistant. Coating Description: Multi Coating. Material: Rubber. Brand: Nikon. Country of Origin: Japan. Manufacturer: Nikon. Date First Available: June 17, 2003. Is Discontinued By Manufacturer: No. Best Sellers Rank: #100 in Camera Lens Color Correction & Compensation Filters. Customer Reviews: 3.8 out of 5 stars 32 ratings 3.8 out of 5 stars. Item model number: B00009R8TV. : B00009R8TV. Item Weight: 1.6 ounces. Product Dimensions: 2.56 x 2.56 x 0.39 inches.