BARSKA 8-32x50 IR AO Excavator IR Target Dot Riflescope 8-32x variable magnification with large 50mm objective lens in a 100% waterproof and fogproof extra rigid shockproof construction Multi-coated optics with Illuminated Target Dot reticles Adjustable Objective lens is built with a adjustable mechanism that allows for parallax correction for specific ranges starting form 20-25 yards to infinity. 1" tube construction with fast focus eyebell Bonus accessories includes set of 5/8" high ring, Sun-shade, and Flip-Up Covers.