The Hoodman Professional LCD Screen Loupe is used to make a close inspection of the review image displayed on your Digital SLR LCD Display. The LCD Screen Loupe isolates the cameras LCD Display from ambient light so you will not be distracted by glare or shadows, and the slight magnification makes it easy to view image details quickly to confirm focus and other image details to ensure that you have the best image possible. It will provide full coverage of an LCD display screen up to 2.75" diagonally with a standard (4:3) aspect ratio.