The Tasco 3-9x40mm configuration is one of the most popular configurations for hunting for a reason! The 3x to 9x magnification power range is supremely versatile and the 40mm objective provides a bright, clear view in all lighting conditions. Power/Obj. Lens (mm): 3-9X40 Field of View (ft.@100yds./m@100m): 39 - 12.7/13-4.2 Lens Coating: Fully Coated Focus Type: Fast Focus Eyepiece Parallax Setting (yds./m): 100/91.4 Eye Relief (in./mm): 3.5/90 Reticle Type: 30/30 Windage/Elevation: .25 MOA Tube Dia.: 1" Finish: Matte Black Exit Pupil (mm): 10/4.6 Model: T3940