The Tasco Rimfire 3-9x40mm configuration provides big game style performance for rimfire rifles. It is designed to allow you to take your rimfire rifle to the maximum of its capabilities and to provide extreme versatility. Power/Obj. Lens (mm): 3-9x40 Field of View (ft.@100yds./m@100m): 32-11/10.7-3.7 Lens Coating*: Fully Coated Focus Type: Fast Focus Eyepiece Parallax Setting (yds./m): 50/45.7 Eye Relief (in./mm): 3.5/90 Reticle Type: Truplex Windage/Elevation: .25 MOA Tube Dia.: 1 inch Weight (oz./g): 11.6/330 Length (in./mm): 12.2/309 Finish: Matte Black Exit Pupil (mm): 14/4.4 Model: TRF3940