This eyepiece is a 4 element Plossl design with coated optics and has a threaded barrel which accepts 48mm filters. Field of view is approximately 50 degrees and eye relief is a comfortable 2.5 inches so this is perfect for those who wear eyeglasses. Exit aperture is 1 3/8 inches. Fits standard 2" focuser and all of the elements are new and coated. Great eyepiece and price.
