The Cassini 10mm Plössl Astroscopic eyepiece is a great addition for any 1.25" telescope. It's great for observing planetary objects such as Saturn, Jupiter, Mars, the Moon, etc. Plössl eyepieces provide excellent image quality and good eye relief and are ideal for a variety of observational purposes including deep sky and planetary viewing. The Cassini 10mm Plössl Eyepiece is a 4 element fully color corrected Plössl eyepiece with an apparent field of view of 50°. The Cassini 10mm Plössl Astroscopic Eyepiece Features and Benefits: Format: 1.25″ Focal Length: 10mm Apparent FOV: 50° Elements: 4 Design: Plössl Fully Color Corrected Blackened edge