SouthBayCamera Rubber Eyecup 1.08x-1.58x Zoom Viewfinder Eyepiece Magnifier fr Canon 5D II 7D 450D 550D 1000D e One (1) 1.08x-1.58x zoom viewfinder eye piece Its ratio can reach 1.08x to 1.58x,which can greatly improve the eyesight of photographer who is with glasses or with ages. Magnifying the viewfinder image helps obtain accurate focus with ease. It also greatly enhances focusing accuracy.