E03 – 9mm illuminated reticle

Bausch&Lomb 9mm eyepiece with illuminated reticle.

An eyepiece with an illuminated reticle (crosshair or grid) has many uses for the astronomer. It’s a necessity for long-exposure astrophotography, where it is used in conjunction with a guide scope or off-axis guider to hold a guide star in a fixed position, to prevent star trailing.

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