focal length of 6mm, 9mm, 15mm and 20 mm ultrawide angle eye piece kit. The Super-wide Angle Eyepiece eyepieces offer a quality 5-element Plossl optical design at a super affordable price. Fixed folding rubber eyecup allows easy use with or without eyewear. Anti-reflection fully multi-coated optics ensure bright and clear high-images at any magnification, with true color rendition. 1.25 inch dia