Barrel

The Quark has been designed to fit on most refractor-based telescopes and comes with a 2-inch and 1.25-inch barrel. The 2-inch barrel has a cut-out to allow for a more precise 1.25-inch mounting in a diagonal for visual use. Care must be taken inserting it into some shallow 2-inch diagonals as the Quark is quite long and can touch the internal mirror.