This Viewfinder Magnifier adjusts the viewfinde'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.This magnifier does not affect the brightness of image at all. does not create any vignetting affect. The added 25mm in distance between user's eyes can avoid frequent contacts of the face and nose with the camera body and LCD display.