Andoer 1.08x-1.60x Zoom Viewfinder Eyepiece Magnifier for Canon Nikon Pentax Sony Olympus Fujifilm Samsung Sigma Minoltaz SLR Camera 1.08x-1.60x Zoom Viewfinder Eyepiece Magnifier for Canon Nikon Pentax Fujifim Samsung Sigma Sony Olympus Minoltaz Dslr Camera (Black) This Viewfinder Magnifier adjusts the viewfinder's image by a ratio of 1.08x-1.6x 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. Magnification Ratio:1.08-1.6 Made in China by Sonovel