The ultima duo eyepiece from celestron combines excellent optics with a built in t adapter for astroimaging with a wide 68 degree apparent field of view it has multi coated optics to increase light transmission and contrast and blackened lens edges prevent internal reflections it will fit both 125 and 2 focusers so you can use it with almost any telescope simply remove the rubber eyeguard to expose the t threads and attach your dslr or ccd camera with a compatible t ring the celestron