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.
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I used the swab as directed and it worked great. My screen was so dirty it took several swabs but it's clean now! I did find out that one forward and one reverse pass is all I could do with each swab. Pricey but a lot cheaper than sending my camera out to get it cleaned! And of course you have to purchase the visible dust solution separately (which is also expensive...but together, they get the job done and done well!
There's nothing inherently wrong with the swabs as they are... But the angled edge is completely useless for a Nikon D7000. You need a flat-ended swab for that sensor, because it's so deep into the camera body. With much fussing, I did manage to clean mine with these, but they're so inconvenient - I'd go with something else next time.