Product Description: 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. 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-1.58x 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 original viewfinder eyecup 2.install the adapter on the viewfinder of the camera 3.screw the magnifier on the adapter suitably Suitable for: Canon:D30/40D/60D/300D/350D/400D/450D/500D/550D/1000D/10D/20D/30D/5D/5D2/7D/EOS1 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 Pentax:K-M/K7/KX/K10D/K100D/K20D/K200D/ISTDL2/ISTDL/ISTDS/ISTD SNY NEX E Mount :a100/a200/a350/a450/a500/a550/a700/a900 Olympus:E-300/E330/E410/E500/E510 Fujifim:S2PRO/S3PRO/ S5PRO Samsung:GX10/GX20 Sigma:SD10/SD14 Minoltaz:ɑ5D/ɑ7D/x-700 Package Included: 1.08x-1.60x zoom viewfinder eyepiece X 1.