Lens Hood/Lens Shade
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 37mm.OEM is available,too.
All lens hoods are fit for Canon,Nikon,Olympus,JVC,Kadak,Fuji,Casio and so on.
Other supplier products
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反射镜（圆形&方形） |
反射镜规格说明如下： *材料:BK7 A glass, 石英, CaF2,晶体或其他 *通光孔径:90% *正方/矩形:1mm to110mm+/-0.2mm *中心厚度公差:+/-0.1mm *光洁度:60-40 to 20/10 *面型:lambda/10 at 632.8nm *平... |
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小球透镜 |
专业生产各种小球透镜。 小球透镜的尺寸说明如下： 材料: BK7, LaSFN9 或其他光学玻璃 球整度: /4 at 633nm 表面质量: 20-10 直径: 1m 镀膜（可选):每面平均 R<1.5% , 400-700nm 在0度入射角 |
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非球面透镜 |
我们提供非球面镜片。
非球面镜片的规格如下：
材料：BK7或其他光学材料
尺寸：10mm - 200毫米
边缘：λ/ 2
中心厚度：15nm的，25nm的
弥散圆：0.03-0.2毫米
心：3弧分
表面质量:60-40划痕/开掘
通光口径：90... |
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Lens Cap/Lens Cover |
A lens cover or lens cap provides protection from scratches and minor collisions for camera and camcorder lenses. Lens covers come standard with mo... |
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Telephoto lens |
Telephoto lens has a narrower angle of view,it thus gives apparent magnification to objects,it also seems to compress distant things, and there is ... |
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单相电表测试仪 |
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单相电表测试仪 |
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数字轨距 |
卖方: Wuhan linkage track equipment co.,ltd |
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数显轨头磨损仪主要用于测量钢轨的垂直磨损和横向磨损，设计合理，重量轻，操作方便，读数直观。
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