SVBONY 12.5mm illuminated eyepiece features double crossline reticle; for accurate polar positioning and long-exposure photo-guiding when using with off-axis guiders for centering and guiding of stars. Double crosshair design, can easily align the target object. Helps locate and center stars well;also fits for guiding astrophotos when used in off-axis guiders or guide scopes; Notice deviation of the positioning easily;so that guide star and reticle appear in ideal sharpness and definition. Adjustable red LED light brightness control to illuminate crosshairs and preserve night vision, you can twist the knob to meet your different requirement. The SVBONY fully metal 1.25" Mirrors Diagonal zenith mirror offers an upright figure which is but turned backward in left and right position. The mirror is compatible with refractors, Celestron EQ, Meade Infinity and similar telescopes. It is not suitable due to the length reflectors for Newton. Brass Compression Ring, provides a uniform pressure receiving area when holding the eyepiece; screw clamps effortless fixes more firmly and will not damage your eyepieces. 1.25" Star Diagonal Mirror accepts 1.25" eyepieces filters and other accessories with a 1.25” insert barrel. Up and down are correct left and right are reversed. Like looking in a mirror, the up and down image is correct, and the left and right are reversed, Good for space viewing, for there is NO upside down or right side up in space.