This zoom viewfinder magnifier is specially designed for DSLR photographing. Its ratio can reach 1.08x to 1.60x, which can greatly improve the eyesight of photographer who is with glasses or with ages. Features: It is improved based on previous series, and come with bigger lens which can better solve the vignette. This Viewfinder Magnifier adjusts the viewfinder's image by a ratio of 1.08x-1.60x and makes the viewfinder's image larger. Magnifying the viewfinder image helps obtain accurate focus with ease. It also greatly enhances focusing accuracy. You need not worry about the brightness of the viewfinder's image being affected after installation, as this magnifier does not affect the brightness of the viewfinder's image at all. This magnifier does not create vignetting affect. How to use: 1. remove the viewfinder eyecup. 2. install the adapter on the viewfinder of the camera. 3. screw the magnifier on the adapter suitably. Specifications: Magnification: 1.08-1.60 Suitability: For Canon D30/40D/60D/300D/350D/400D/450D/500D/550D/1000D/10D/20D/30D/5D/5D2/7D/EOS1; For Nikon D40/D50/D70/D70S/D80/D90/D100/D200/D300/D500/D500/D700/D800/D3000/D5000/D1H/D1X/D2H/D2X/FA/F6/F75/F80/F801S/F90 F100; For Pentax K-M/K7/KX/K10D/K100D/K20D/K200D/*ISTDL2/*ISTDL/*ISTDS/ ISTD; For Sony 100/200/350/450/500/550/700/900; For Olympus E-300/E330/E410/E500/E510; For Fujifilm S2PR0/S3PRO/S5PRO; For Samsung GX10/GX20; For Sigma SD10/SD14; For Minoltaz5D/7D/x-700 Package Size: 10 * 10 * 3.5cm / 3.94 * 3.94 * 1.38in (L * W * H) Package Weight: 72g / 2.54oz Package List: 1 * 1.08x-1.60x zoom viewfinder eyepiece