Celestron 93235 CrossAim Reticle Eyepiece (Black/Silver) Ideal for Accurate Polar Alignment Well suited for use with Off-Axis Guiders for centering and guiding of stars Adjustable red LED light brightness control to illuminate crosshairs and preserve night vision Double crosshair reticle for accurate centering and guiding of stars Fully coated optics for excellent light transmission on faint stars Includes reticle eyepiece and illuminator