JMC Scientific Consulting Ltd, Egham, Surrey, TW20 8LL, UK.
Int J Cosmet Sci. 2020 Apr;42(2):136-145. doi: 10.1111/ics.12591. Epub 2020 Jan 27.
Photography can be a powerful tool for researching the skin. Moving outside the visible spectrum and into the ultra violet (UV) presents a unique set of challenges to the skin photographer because of the restrictions imposed by the equipment being used. This article discusses these challenges in relation to camera sensitivity, lens and filter transmission and lighting spectrum, with the aim of demystifying what is actually being captured when imaging skin.
In addition to a discussion of existing data on the subject of camera sensor sensitivity, filter transmission and flash spectral analysis, transmission in the UV of a variety of camera lenses using a new method has been carried out.
Using the described approach, lens transmission between 280 and 420 nm of a range of lenses has been measured. Combining this with camera sensor sensitivity data and filter and light source characteristics, it has been possible to determine an overall, harmonized, spectral sensitivity curve for what is being imaged with a given setup.
UV reflectance photography, while a powerful tool, is often misunderstood and misreported as to what is actually being imaged. By combining measurements on camera sensitivity, lens and filter transmission and light source spectra the researcher can more fully understand what is they are actually measuring, thereby enabling better communication with the consumer on what they are seeing and a more complete description for any claims support.
摄影可以成为研究皮肤的有力工具。将摄影范围从可见光谱扩展到紫外线（UV）会给皮肤摄影师带来一系列独特的挑战，因为这需要受到所使用设备的限制。本文将讨论与相机灵敏度、镜头和滤光片传输以及照明光谱相关的这些挑战，旨在揭示在拍摄皮肤图像时实际捕捉到的内容。
除了讨论有关相机传感器灵敏度、滤光片传输和闪光灯光谱分析的现有数据外，还采用了一种新方法对各种相机镜头在紫外线中的传输进行了研究。
使用所描述的方法，测量了一系列镜头在 280 至 420nm 之间的镜头传输。将此与相机传感器灵敏度数据以及滤光片和光源特性相结合，就可以确定给定设置下所拍摄图像的整体、协调的光谱灵敏度曲线。
尽管紫外线反射摄影是一种强大的工具，但它经常被误解和错误报告，以至于人们不清楚实际拍摄到的是什么。通过结合对相机灵敏度、镜头和滤光片传输以及光源光谱的测量，研究人员可以更全面地了解他们实际测量的内容，从而能够更好地与消费者沟通他们所看到的内容，并为任何支持性的声明提供更完整的描述。
