White balancing lens cap
Kaiser Vivicap VC-55 6606
Practical, it can serve to white balancing your camera before shooting a picture.
This snap-on filter is specially designed with a prism structured surface for white-balancing of digital cameras and camcorders.
Easy to use clamping mechanism provides for quick installation and removal.
Serves also as a lens cap and can also be attached when a lens hood is used.