The baader hyperion eyepiece t adapter enables you to attach cameras fitted with t rings to baader hyperion eyepieces for eyepiece projection photography it is suitable for use with baader eyepieces with a 43mm thread such as hyperion fixed focal length eyepieces and the mk iii 8 24mm zoom eyepiece but not the mk ii zoom eyepiece attaching to the thread and converting it to a t 2 type which will fit onto your camera specific t 2 adapter the t adapter is compatible with extension tubes