The HoodLoupe Optical Viewfinder for 3.2" LCD Displays is used to make a close inspection of images as you review them on your DSLR camera's LCD monitor. The viewfinder isolates the display from ambient light so you will not be distracted by reflections or shadows during use. It will provide full coverage of an LCD monitor up to 3.2" diagonally with a standard (3:2) aspect ratio.