This baader eyepiece set contains a set of four dual purpose 1252 inch eyepieces with focal lengths ranging from 5 to 24mm each utilises baaders phantom group multi coating to ensure sharp contrast and maximum light transmission and features both a m43 and sp54 photographic thread housed under a protective silicone rubber ring the focal length of all bar the 24mm eyepiece may be increased by removing the front lens group or by the addition of separately available fine tuning rings