Combining a brilliant optical system with a built-in T-adapter for astroimaging, the Ultima Duo eyepiece from Celestron has a wide 68-degree apparent field of view, and multi-coated optics to increase light transmission and contrast. With fittings for both 1.25” and 2” focusers, it can be used 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 The Celestron Ultima Duo 17mm Eyepiece has 8 lens elements in 5 groups to ensure that chromatic aberration and field curvature are corrected, guaranteeing a sharp, high-quality result.
Celestron Ultima Duo 17mm Eyepiece:
High performance photo-visual eyepieces quickly switch between observing and imaging
Fully multi-coated optics with 8 elements in 5 groups for the best correction of chromatic aberration and field curvature
Extra wide 68-degree apparent field of view
Full 20 mm of eye relief
Integral 42 mm T-adapter threads and threaded barrel for filters