Solomark 1.25" 6mm 58-Degree Planetary Eyepiece For Telescope Designed primarily for planetary observation but great for deep sky objects too. Wide 58- degree Field of View (FOV) in 2.5mm to 25mm focal lengths. Comfortable eye relief averaging 16mm across the series. Exceptional at nearly eliminating lateral color aberration and light scatter while retaining excellent sharpness, contrast and definition. In field use, perform as well as other, more expensive Orthoscopic and Plossl eyepieces.