Features:Viewfinder magnifier can adjust the viewfinder's for image by a ratio of 1.08x-1.52x adjustable and makes the viewfinder's for image larger.Magnifying the viewfinder for image helps to obtain accurate for focus with ease, also greatly enhances focusing accuracy.High-quality anti-fog optical glass, do not create vignetting effect or affect brightness after installation.Good helper for people with short / long for vision, allows you to see clearly without wearing lasses.Comes with 3 magnifier mounting bases, universal for various DSLR cameras in the market. Specifications:Magnification: 1.08X-1.52X AdjustableMaterial: Silicone+Plastic+GlassLens Diameter: Approx. 2.6 for cm/1.02 inchColor: Black Note:Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes:1 Piece Zoom Eyepiece Viewfinder with Cover2 Pieces Eye Patches3 Pieces Viewfinder Mounting Bases