From the manufacturer

VMX-3T Magnifier (VMX-3T)

Simple, fast, effective—the VMX-3T Magnifier will work with any of our red dots but it is Not recommended for use with the prism scopes. The push-button design of the VMX-3T engages and disengages the flip-mount, allowing the magnifier to lock in place. The result, 3x magnified or unmagnified views at will. Optics are fully multi-coated for optimal light transmission. Lightweight and tough; hard-coat-anodized machined-aluminum construction ensures durability. Internally nitrogen purged for reliable waterproof/fogproof performance. Ultimate magnified versatility for virtually any red dot sight.

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.

Mounting the VMX-3T Magnifier

Using the included screws, attach the VMX-3T magnifier to the Flip Mount. Ocular lens and Release Button should face shooter.

Absolute Co-Witness Height with Flip Mount

Positions the VMX-3T at 37 mm from the base surface to the center of the optic. This puts the dot height at a center (absolute) sight picture when co-witnessed with standard iron sights. For this height, do not install the included plate.

Lower 1/3 Co-Witness Height with Flip Mount and Plate

Positions the VMX-3T at 40 mm from the base surface to the center of the optic. This puts the dot height at a lower 1/3 sight picture when co-witnessed with standard iron sights. For this height, install the included plate between the VMX-3T and the Flip Mount.

Center the Red Dot Image

The dot-centering screws can be used to help center the red dot in the VMX-3T’s field of view. After the VMX-3T is mounted in front of red dot scope, the dot may seem off-centered while viewing through the VMX-3T. This will not affect the point-of impact. If desired, the centering screws can be used to move the dot up/down or left/right until the dot is more centered.

Adjust the Focus

Use the focus knob to achieve a sharp image. Turn the focus dial clockwise or counter-clockwise until image is as sharp as possible.

Using the Flip Mount

To use the included flip mount, simply push on the release button and flip the VMX-3T off to the side.

Offering 3x magnification along with durable construction, the Vortex VMX-3T with included Flip Mount can quickly add extended range ability to red dot sights. The VMX-3T is easy to use and does not require any special sight-in—just zero-in the red dot as normal and add the VMX-3T behind for additional 3x magnification.