This focusing screen features the matte field with cross-split image in the center dividing the subject in half both vertically and horizontally for more accurate manual focusing. If you are using a manual focus lens, not satisfied with the accuracy of your AF lens, or are using a lens mount adapter; this split screen is your best choice as it brings you a brighter view finder for a clearer picture. Features a Precision Matte surface, AF points remain fully visible, and focus characteristics suited to most lenses. For the best results use an aperture of f/5.6 or faster. An Ideal purchase for users who frequently manually-focus in dim light with fast lenses.