This illuminator will screw into the eyepieces of any of the finderscope above to provide you with a variable brightness red illumination on your crosshair. Vary the brightness to suit your preference. Two small knobs allow you to adjust the pulsation of the light so it blinks on and off at the rate you prefer. One knob controls how long the light is off and one how long it remains on. The blinking light allows you to see the object you are centering and the crosshair vividly.
