BARSKA 6-24x50 IR AO Excavator Target Dot Riflescopebr 6-24x variable magnification with large 50mm objective lens in a 100 waterproof and fogproof extra rigid shockproof construction br Multi-coated optics with illuminated target dot reticles br Adjustable objective lens is built with a adjustable mechanism br 1 inch tube construction with fast focus eyebell br Bonus accessories includes set of 58 inch high ring sun-shade and flip-up covers br That allows for parallax correction for specific ranges starting form 20-25 yards to infinity