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Changing lenses
Vizy can work with two types of lenses – M12 and C/CS-mount. M12 is the same type of lens commonly used with action cameras like GoPro. C/CS-mount is often used in industrial/security applications. Being able to use both types of lenses means Vizy can be used with a wide range of off-the-shelf lenses. Since Vizy has an actuated IR-cut filter, it's recommended that you use lenses that do not have IR-cut filtering. Fortunately, these lenses are more common.
Attaching zoom lens, or any other C/CS-mount lens
Vizy's 8-50mm zoom lens is a C/CS mount lens.
Remove the existing lens by loosening the set screw – use a screwdriver if necessary.
Unscrew lens by grabbing the outermost ring.
Attach spacer to lens and tighten.

(screw on spacer)
Make sure the aperture is fully open.

(open aperture
Screw the lens into the lens mount.

(screw lens into lens mount)
Tighten the set screw so the lens doesn't rotate in the mount when you focus/zoom.

(tighten set screw)
Attaching M12 lens
Vizy ships with a wide-angle M12 lens mounted in an adapter ring. You can use the adapter ring to mount your own M12 lens.
Remove the existing lens by loosening the set screw – use a screwdriver if necessary.
Unscrew lens.
Loosen and remove the lock ring from the wide-angle lens – use pliers if necessary.
Unscrew wide-angle lens from adapter ring.
Screw in new lens into adapter ring.
Screw adapter ring into the lens mount.
Focus as described below.
Use the lock ring and set screw to fix the focus if you like.
Focusing
Bring up a browser and point it to your Vizy.
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Focus the lens on your subject while using the video feedback in your browser.