THIS IS THE SPEC. ON ALL THREE FROM LEUPOLD WEB SITE. YOU CAN MAKE A COMPARISON BETWEEN ALL THREE. HOPE THIS HELPS...

VX-III 4.5-14x40mm
Product Specifications
Actual Magnification: 4.8(4.5x) 14.2(14x)
Length (in): 12.6
Eyepiece Length (in): 2.9
Objective Length (in): 3.6
Objective Diameter (in): 1.8
Eyepiece Diameter (in): 1.55
Tube Diameter: 1.0in
Weight: 13.2 oz. / 374.2 grams
Eye Relief (in): 4.4(4.5x) 3.6(14x)
Eye Relief (mm): 112(4.5x) 93(14x)
Obj. Lens Diameter: 1.6in / 40mm
Max. Adjustment @ 100 yds (in): 67
Max. Adjustment @ 100 m (cm): 186
FOV @ 100 yds (ft): 19.9(4.5x) 7.4(14x)
FOV @ 100 m (m): 6.6(4.5x) 2.5(14x)

VX-III 4.5-14x40mm Adj. Obj.
Product Specifications
Actual Magnification: 4.9(4.5x) 14.3(14x)
Length (in): 12.5
Eyepiece Length (in): 3.2
Objective Length (in): 4.0
Objective Diameter (in): 2.0
Eyepiece Diameter (in): 1.6
Tube Diameter: 1.0in
Weight: 15.0 oz. / 425.0 grams
Eye Relief (in): 5.0(4.5x) 3.7(14x)
Eye Relief (mm): 127(4.5x) 94(14x)
Obj. Lens Diameter: 1.6in / 40mm
Max. Adjustment @ 100 yds (in): 67
Max. Adjustment @ 100 m (cm): 170
FOV @ 100 yds (ft): 20.8(4.5x) 7.4(14x)
FOV @ 100 m (m): 6.9(4.5x) 2.5(14x)

VX-III 4.5-14x40mm Long Range
Product Specifications
Actual Magnification: 4.9(4.5) 14.6(14)
Length (in): 12.6
Eyepiece Length (in): 2.9
Objective Length (in): 3.6
Objective Diameter (in): 1.8
Eyepiece Diameter (in): 1.6
Tube Diameter: 30mm
Weight: 15.4 oz. / 436.6 grams
Eye Relief (in): 4.4(4.5) 3.6(14)
Eye Relief (mm): 112(4.5) 93(14)
Obj. Lens Diameter: 1.6in / 40mm
Max. Adjustment @ 100 yds (in): 70
Max. Adjustment @ 100 m (cm): 194
FOV @ 100 yds (ft): 18.7(4.5) 7.3(14)
FOV @ 100 m (m): 6.2(4.5) 2.4(14)