Thanks to the Zoom Vortex SV knob, it increases the precision of changing the magnification, improves its fluidity and makes it easier to operate while wearing gloves and at low temperatures.
The dial is compatible with telescopes that have a zoom ring with a diameter of 42 mm (1.669 inches), including:
• Viper PST Gen I with a rubber zoom ring
• Viper HS with rubber zoom ring
• Diamondback HP
Manufacturer's VIP lifetime warranty