Hot New Scope The zoom ring has an inner drum with markings and a fixed inner ring with a window cutout. Only the outer ring and markings will turn when adjusted. The window is always facing the shooter – Calibrated for the .17 HMR. – Adjustable Parallax. – Includes 17gr turret drums. – Limited Lifetime Warranty. – Magnification: 6-18 – Obj. Lens Diameter (mm): 40 – Exit Pupil Range (mm): 6.6-2.3 – Field of View @100 Yds: 16.6-4.8 – Optimum Eye Relief (in): 4 – Parallax Setting: 10 to Inf. – Click Adjustment Value: 1/4 – Adjustment Range: 35-35 – Weight (ounces): 17.60