Specifitions:

Magnification: 4-16x
Objective Lens Dia.:50mm
Tube Dia.:30mm
Adjustment Click Value: 1/4 MOA
Illumination: Yes
Ocular Dia: 44mm
Ocular Length: 67mm
Field of View: 30-8ft
Eye Relief: 3.5"-3.2"
Exit Pupil: 12.5-3mm
Lens Coating: Fully multicoated
Finish: Matte
Distance between objective lens part and middle turret: 47mm
Length of middle turret part: 61mm
Distance between middle turret part to power ring: 42mm 
Diopter compensation from fast-focus eyepiece (+2 to -2.5)

Fetures:

30mm Monotube. 1/4 MOA windage and elevation adjustments for fine-tuning accuracy.
 Illuminated reticle 
The illunimation has stepless brightness.
Turret lock feature: Pull to adjust, press to lock.
Side Focus starts at 10 Yard.
Fast-focus Eyepiece for quick and easy reticle focusing
O-ring Sealed and Nitrogen Purged Ensure Water Resistance and Fog Proof performance
High quality 6061 T6 aircraft grade aluminum alloy with durable black matte finish.