NEW UNUSED The advantages : mini guide scope for rapidly locating astronomical objects and guide stars designed for both visual and photographic use use any 1.25 inch eyepiece from your collection worm-gear focuser for rapid focusing. - prevents the rotation of camera and eyepiece. What is special about Omegon guide scope? It has a built-in worm-gear focuser with 10mm displacement, allowing very precise focus adjustment. The mechanism has a fixed orientation - so there is no rotation of mounted cameras or eyepieces - or also the field of view with your guide star - when focusing. The robust metal housing is made of black, anodized aluminium It not only looks solid, but is very sturdy. A milled and knurled focusing ring allows straightforward and precise fine focusing. It comes with matching tube clamps and a Synta-style mounting plate to make assembly and disassembly as simple as possible.