With focal extenders (also known as teleconverters), 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 longer focal length eyepieces, such as their greater eye relief and more comfortable viewing at higher magnifications. These highly corrected focal length extenders offer excellent image quality across the entire field of view thanks to their four-element design, making them ideal for both visual observation and photography. The combination of superior anti-reflective coatings and telecentric design makes focal extenders significantly better than standard Barlow lenses.