Description
In photography, a lens hood or lens shade is a device used on the
end of a lens to block the sun or other light source in order to
prevent glare and lens flare.
The geometry of the lens hood can vary from a plain cylindrical or
conical section (much like a lamp shade) to a more complex shape,
sometimes called a petal, tulip, or flower hood. These more complex
shapes of lens hood take into account the final image\'s shape and
aspect ratio.[3] This allows the lens hood to block stray light
with the higher portions of the lens hood, while allowing more
light into the corners of the image through the lowered portions of
the hood, thereby reducing the amount of vignetting in the final
image.
Ideally, lens hoods should increase in length, and therefore in
efficiency, as the focal length of the lens increases and the angle
of view reduces. Lens hoods are more prominent in long focus lenses
because they have a smaller viewing angle than that of wide-angle
lenses. For wide angle lenses, the length of the hood (away from
the end of the lens) cannot be as long as those for telephoto
lenses, as a longer hood would enter the wider field of view of the
lens.
VY Optics could manufacture varied size of lens hood or lens
shade,picture shown is *7mm.OEM is available,too.
All lens hoods are fit for Canon,Nikon,Olympus,JVC,Kadak,Fuji,Casio
and so on.
