Celestron - 10mm Plossl Reticle Eyepiece

Guiding (or reticle) eyepieces are mandatory for guided astrophotography. They keep a guide
star stationary during long exposures to avoid star trailing. 
This 5-element guiding
eyepiece has a reticle pattern that is a .0075" double spaced line system. The optics are
multicoated for increased contrast and have long eye relief. The high power is ideal for guiding
and it has a 50° apparent field of view. 
This type of reticle pattern allows you to
position the guide star in the middle square or at the intersection of two lines, whichever is
easier for you. An optional illuminator (60011) is required.