All scopes in the SIII series feature a 30mm one-piece Main-Tube made from high quality Aircraft aluminum. Tube thickness is more than twice as thick as one inch models to provide maximum rigidity. All models are fogproof, shockproof and waterproof. Side Parallax focus is available on all SIIB SS models and SIII SS LR Series Riflescopes. Designed for ease of use in prone and bench shooting the side focus will focus from 10-40 yards to infinity depending on the specific model. Large oversize target knobs with 1/4 inch adjustments are standard on all models. All models feature target knobs that are re-settable to zero. All target knobs are protected by large heavy windage and elevation caps. . This scope features the ultimate in all weather construction. They are waterproof, nitrogen filled and provide a lifetime of internal fog protection for inclement weather. A European style fast focus eyeball accompanies all SIII SS Long Range Models. A quick turn of the eyebell allows the user to focus in a matter of seconds. Tweaking the eye focus is just a small adjustment away. This scope features Sightron"s unique ExacTrack windage and elevation adjustment system. No other system on the market comes clost to the precision and performance of ExacTrack. Specifications: - Magnification: 8-32X - Object Diameter: 56 - Eye Relief: 3.6-4.0 - Reticle Type: Fine CrossHair - Click Value: 1/4 MOA - Fov: 12.2-3.1 - Length: 15.35 - Tube Diameter: 30mm - Windage Elevation Travel: 70 - Weight: 24.70 - Finish: Matte Black - Minutes Per Revolution: 15 - Target Knobs: Yes - Sunshade Included: Yes - Windage Elevation Knobs: Target Type (Resetable) - Adjustable Objective: Side Focus - Fully Multi Coated: Yes (Zact-7 TM 7-Layer)