BOTH THE Canon and Carl Zeiss lenses on test here have the same focal length and wide aperture, but could hardly be more different in design and intention. When reviewing the 85mm f/1.4 lenses in AP 26 June, I made the point that an 85mm focal length on 135 and full-frame format offers a good general-purpose short telephoto lens. It does not isolate the main subject too much from its background, and the compression of planes, which gives an uncomfortable perspective effect with long lenses, is minimal. So what is the purpose of a 100mm focal length that is likely to begin to show these effects? Well, it has an important role in portraiture for 'big head' shots, and the wide aperture gives available light capability and depth of field control, enabling grab shots of individuals without flash.
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机译：佳能和卡尔蔡司镜头均具有相同的焦距和宽光圈，但在设计和意图上几乎没有什么不同。当在6月26日的AP中审查85mm f / 1.4镜头时，我指出135和全画幅格式的85mm焦距提供了一个很好的通用短焦远摄镜头。它不会将主要拍摄对象与其背景相隔太远，并且平面压缩（使用长镜头会产生令人不适的透视效果）的可能性很小。那么，可能会开始显示这些效果的100mm焦距的目的是什么？好吧，它在人像摄影中对“大头”拍摄起着重要作用，大光圈可提供可用的照明能力和景深控制，从而可以为没有闪光灯的人抓拍。
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