Alstar Reticle Eyepiece, 12.5MM LED Illuminated Telescope Plossl Eyepiece

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Precision Tool: Illuminated Reticle Eyepiece with red LED illuminated dual-line crosshair reticle precision tool for measuring double star separations planetary lunar dimensions and celestial position angles
Comfortable Eye Relief: This Illuminated Crosshair Eyepiece offers a wider field of view with bright high-contrast images featuring a 40 degree apparent field of view and 11 mm of comfortable eye relief
Premium Multi-Coated Optics: The optical system features fully multi-coated anti-reflection coatings on a four-element Plossl design delivering superior color correction and image sharpness
Double Crosshair Eyepiece: The double crosshair design facilitates precise alignment of target objects enhancing the accuracy of locating and centering celestial bodies; This eyepiece is particularly suitable for guiding astrophotography when used with off-axis guiders or guide scopes
Brightness Adjustable: Requires three L1131F button cells (not included); The 12.5mm eyepiece features stepless adjustment via a knob on the side and includes a separate dioptre adjuster to allow simultaneous focusing of both stars and crosshairs