The Hoodman HoodLoupe Optical Viewfinder for 3.2 LCD Displays is used to make a close inspection of images as you reviews them on your DSLR camera s LCD display. The LCD screen Loupe isolates the display from ambient light so you will not be distracted by reflections or shadows in it. This makes it easier to view image details quickly to confirm focus and ensure that you have the best image possible. It will provide full coverage of an LCD display screen up to 3.2 diagonally with a standard (3:2) aspect ratio. The Compact HoodLoupe also shrinks down 30% smaller for easier transport and storage when not in use - going from 3.25 to 2.25 with ease.