Mcoplus 1.08x-1.60x Zoom Viewfinder Eyepiece Magnifier for Canon Nikon Pentax Sony Olympus Fujifim Samsung Sigma Minoltaz DSLR Camera Mcoplus 1.08x-1.60x zoom viewfinder eyepiece . Magnification Ratio:1.08-1.60 Adjust by manual This Viewfinder Magnifier adjusts the viewfinder's image by a ratio of 1.08x-1.58x and makes the viewfinder's image larger. 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 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