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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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 an... |
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棒镜,玻璃一字镜 |
尺寸范围: 3-50mm 两端抛光、柱面抛光、全抛光 直径公差 ：+0/-0.02mm 厚度偏差 ：± 0.02mm 中心偏差 ：90% 倒角 ：0.1-0.25mm*45° 镀膜 ：按要求 材 料 ：浮法，K9 ,熔石英,蓝宝石,SF11，CaF2,MgF2及其它光学玻璃和晶体 |
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波片 |
光学波片尺寸说明如下： 尺寸公差:+/-0.20mm to +0.01/-0.01mm 厚度公差:+/-0.20mmto +/-0.005mm 光洁度:80-50 to 10-5 面型: at 633nm lambda -- lambda/20per 25mm 通光孔径:80% -- ... |
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晶体结构：三方，a=b=5.148 ,c=13.863 生长方法：提拉法(CZ) 熔点：1250℃ 比重：4.64g/cm2 居里温度：1142±2℃ 莫氏硬度：55 热膨胀系数： a11=15.4×10-6/K a33=7.5×10-6/K ... |
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投影鱼眼镜头 |
鱼眼镜头是广角镜头，在一个非常广泛的，半球形的形象所鱼眼镜头的焦距取决于format.Fisheye电影镜头实现放弃一条直道形象极其广泛的角度，而是选择了一个特殊的映射（例如：equisolid的角度），从而使图像外观特征凸。通过旋转镜头或拼接图像（圆柱的角度）的全景，是不是鱼眼照片。
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