Combining excellent optics with a built-in T-adapter for astroimaging, the Ultima Duo eyepiece from Celestron has a wide 68-degree apparent field of view. Its multi-coated optics are designed to increase light transmission & contrast, & there are 8 lens elements in 5 groups to guarantee chromatic aberration & field curvature correction. It will fit both 1.25 & 2 focusers, so you can use it with almost any telescope. Simply remove the rubber eyeguard to expose the T-threads, & attach your DSLR or CCD camera with a compatible T-ring. The Celestron Ultima Duo 13mm Eyepiece is ideal for imaging bright solar system objects & will produce high-contrast, bright results.