10-30x30 Zoom Brass/Leather-Sheathed Nautical Spyglass Telescope w/ Case It produces a sharp non-inverting (upright) image. It has a precision 30mm objective lens and all optics are the highest quality with full anti-reflection coatings. The telescope is solid brass. Unlike our other spyglass telescopes where you have to shorten the smallest pipe to focus, this telescope has a unique feature where you simply rotate the eyepiece to bring the image into crystal clear focus. The 10-30 zoom telescope has a second copper-colored ring to control the zoom. This telescope has a special scratch resistant clear coating that eliminates tarnish and fingerprints on the brass. The zoom telescope allows continuous adjustment of magnification from 10 power to 30 power. It comes with a leatherette zippered carrying case with both a hand strap, a belt loop and lens cleaning cloth. The telescope is 1 3/8" in diameter, 13.5" long when fully extended, 5 3/8" long when collapsed and weighs 8.3 ounces. It is engraved "Stanley London" near the eyepiece.