The celestron omni xlt 150mm 6 f5 refractor is for intermediate users and combines high quality optics with an elegant portable design thats ideal for general observation of deep sky objects the starbright xlt optical coatings maximise light transmission and reduce internal reflections for the brightest possible images the cg 4 german equatorial mount helps you navigate the night sky quickly and track objects smoothly using aspheric shaping technology in conjunction with hand figuring th