Vanguard Endeavor RS IV rifle scopes are higher level hunting rifle scopes than the RS Series, but still for an affordable price. All the series of Vanguard Endeavor rifle scopes use HOYA ED (Extra-low Dispersion) glass, that gives you good quality and a sharp edge to edge image.
Vanguard Endeavor RS IV rifle scopes have 4x or 6x zoom ratio from minimum 1x and maximum 20x magnification, depending on the model. The ring for magnification adjustment is simply rotatable in 180 degrees.
All Vanguard Endeavor series have anti-reflective coated lens, which greatly increases the light transmission. The outer lens have also a hard anti-scratch coating.They have reticle placed in the second focal plane, so when zooming, the size of the reticle always stays the same. Vanguard Endeavor RS IV rifle scopes series have illuminated reticles. If you are using optical glasses, the sharpness can be adjusted with a fast focus eyepiece. BDC (ballistic Drop Compensation), Duplex or German 4 reticles with an illuminated red dot can be chosen.
All Vanguard rifle scopes are built out of solid aircraft grade aluminum, which means, the tube is robust and also coated with an anti-scratch coating. All Rifle scopes from this series are waterproof and fogproof, because of nitrogen filling and tight O-ring sealing. The parallax is fixed at 100 yards (91 meters), except on the bigger magnification model (Vanguard RS IV 5-20x50), there is an aditional turret for adjusting the parallax from 50 yards to infinity. The turrets can be easily reset to zero, and all rifle scope tubes have a clamping diameter of 30 mm.
The Vanguard Endeavor RS IV rifle scopes can only be mounted with 30 mm rings.