Celestron 12.5mm Abbe Orthoscopic Micro Guide Eyepiece (1.25")

The multifunction Celestron Abbe Orthoscopic Micro Guide Eyepiece features a laser-etched reticle with built-in battery illumination.  The eyepiece is a multicoated 12.5mm four-element Abbe Orthoscopic design.  Usage possibilities include direct guiding on stars outside the center of the field of view, greatly improved off-axis guiding to capture much fainter, sharply focused guide stars without reducing limiting magnitude, and measuring position angles and separation of double stars.

The Micro Guide Eyepiece is free of internal reflections and offers sufficient eye relief for the reticle to be viewed easily with eyeglasses.  Its finely-etched micrometer scale has gradations 50 microns apart and 15 microns wide.  The apparent field of view is 42°.