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The Sky-Watcher Quantum 120mm Refractor is a high end instrument built for the Pro's. Perfect for Imaging the Sky-Watcher Quantum Refractor has a ton of features. The Sky-Watcher Quantum Refractor delivers diffraction limited optics that will perform flawlessly to the theoretical limits of their aperture sizes. The Sky-Watcher Quantum virtually eliminates residual chromatic aberration, otherwise known as false color, the Sky-Watcher Quantum 120 has an F/ 7.0 Focal Ratio.