Ideal for autoguiders and guide cameras, and equally usefully when installed on focusers, diagonals, and other visual accessories, the Alpine Astronomical Ultrashort 1.25" / T-2 Eyepiece Holder is designed to provide a reliable and simple way to hold your gear. It is made with a short 12mm optical length, and its tight tolerances minimize sloppiness, which can lead to movement and canting. Three clamp screws further help to ensure the eyepiece is centered and accurately optically aligned, with a brass compression ring to hold your gear without marking or marring the nosepiece. Standard T-2 internal (female) threads are machined into the telescope side of the holder to make it compatible with all other components of their T-2 Astro modular accessory system.