The Visible Dust Focusing Screen Swab is designed to handle those hard to remove spots that can accumulate on your Digital SLR camera focusing screen. With the addition of Visible Dust Sensor Clean or Chamber Clean solvents, it will remove any undesirable contamination. The specially designed 45 degree angle swab head makes it easy to clean off the focusing screeen surface in any DSLR so you'll have an unimpeded view of your subject through the cameras optical viewfinder.