The LensPen is such an essential to keeping all kinds of optics ready for maximum performance, you'd think everyone would have at least one. It's so simple, so effective and so dependable. Small enough to clip in a pocket or toss it in a bag, LensPen has two easily accessible working ends. Slide out the brush end first and use it to effectively remove all loose dust and dirt from the lens or eyepiece. The retractable brush, made natural goat hair, is so gentle it can do no damage to the optics, yet it's so hardworking the dust vanishes. That still leaves pesky fingerprints or other grease blemishes on the glass. Just take the cap off the other end and the flexible chamois tip, which matches surface shapes and countors, is ready to work. That chamois tip, embedded with a carbon compound, is ready to tackle the toughest prints. It's essentially the same principle that makes the use of newspapers still a popular home remedy for cleaning windows – the same carbon compound is used in printer's ink. And the cap has a pad of carbon compound to constantly refresh the chamois. There's never anything to spray on, nothing to dry out or wear out, nothing to replace, so there's no expiration date to a LensPen. And you can use it with confidence — whether you are in extreme desert heat or arctic cold — knowing that it can do no damage of any kind to your gear or the environment. LensPens are RoHS compliant and meet even California's rigid Proposition 65 standards. And they sure can do a lot of good for your lenses. Using a LensPen is the most effective way to keep lenses and eyepieces at their sharpest. First, use the retractable brush to remove all dust; then use the flexible chamois tip at the other end to remove fingerprints, as shown.