For Lenses, Eyepieces, Scopes & More Long-Lasting Non-Liquid Cleaning Element Soft, Retractable Dust-Removal Brush Protective Cap for Cleaning Element This LensPen Optical Cleaning Tool from Celestron makes it easy to keep all your optics free of dirt, smudges, and grease. Perfect for cleaning binocular lenses, small aperture spotting scopes, telescopes, and eyepieces, it comes with a handy retractable brush that removes dust. The special non-liquid cleaning element is designed to never dry out and is both safe and easy to use.