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.
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胶合透镜规格说明如下： *材料:BK7 and ZF2(或者根据客户要求) *直径:+0/-0.05 *中心厚度公差:+/-0.1 *光洁度: 60-40 Scrath/Dig *面型:0.5-0.2 *中心偏 < 3arc min *倒角:0.1-0.25*45 degrees *设计... |
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转接环 |
我们转接环规格如下： * M25号， 27,28,30,30.5,34,40.5毫米， 43毫米， 46毫米， 49毫米到37mm * M37 ， 40.5,43,49,55,58,62到52毫米
* M52 ， 55到58毫米
* M55的， 58,62,67到72mm
* M67 ，... |
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双凸球透镜 |
平凸透镜，平凹透镜，双凸透镜，双凹透镜，婉约透镜，特殊球透镜等等。 平凸球透镜规格说明如下： *材料:BK7或者其他材料 *焦距:+/-1% *中心厚度公差:+/-0.01mm *中心偏:1 弧分 *面型:λ/2@ 633nm平面 *光洁度:40/20 *通光孔径>90% ... |
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铌酸锂晶体 |
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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阿米西棱镜 |
我们的阿米奇棱镜如下规格： *材料BK7或紫外级石英 *尺寸公差+ /毫米的 *清除孔径> 80％ *表面质量：60/40划痕/挖 *表面平整度在633nmλ/ 4 *角度公差60度+ / -3分钟 *倒角0.3毫米+ /毫米的米 *涂料可选 |
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