Vortex Optics VMX-3T Magnifier with Built-In Flip Mount The VMX-3T Magnifier and Flip Mount combo adds a 3x magnification to your rifle's red dot sight. Simple, fast, and effective, the push button design engages and disengages the flip mount allowing the magnifier to lock in at your desired position. The lens are fully multi-coated maximizing resolution, light gathering capability, and color fidelity. The VMX-3T gives you a generous 3.25 inches of eye relief with a 38.2 foot field of view at 100 yards. The VMX-3T does not require any special sight-in. The dot centering screws can be used to help center your red dot image in the VMX-3T's field of view. The magnifier is nitrogen purged for reliable waterproof and fogproof performance in the field. Allows for lower 1/3 or absolute co-witness mounting heights and is ideal for shooters who want to increase the effective range of their red dot sight. Field of View: 38.2 feet/100 yards