With focal extenders (also known as tele extenders), you can extend the focal length of your telescope and increase magnification for observing the Moon, planets, or small deep-sky objects. This allows you to take advantage of long focal length eyepieces, such as the large eye relief and more comfortable viewing at higher magnifications. These highly corrected focal length extenders provide excellent image quality across the entire field of view thanks to their four-lens design, making them ideal for visual observation and photography. The combination of superior anti-reflective coating and telecentric design makes focal extenders significantly better than standard Barlow lenses.