BARSKA 8-32x50 IR AO Excavator 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 Range Finding Graph reticles Adjustable Objective lens is built with a adjustable mechanism that allows for parallax correction for specific ranges 1 inch tube construction with fast focus eyebell Bonus accessories includes set of 5/8 inches high ring, Sun-shade, and Flip-Up Covers