​

卡什的肖像照片风格独特，自成一家，成为后来者必须学习的范本。他使用8×10的大相机、大页片和结像十分清晰的爱克塔镜头，小光圈拍摄。因此，这些照片层次丰富，影纹清晰，质感强烈，皮肤上的纹理、毛孔、胡须历历可数。在表现人物的时候，他除了关注人物的脸部，还特别注重手的作用，尤其是在拍摄那些经常运用双手来表达思想感情的政治家、音乐家、画家时，总是设法把人物的双手组织到画面中，进一步扩大和丰富肖像照片的表现力。在灯光的运用方面，卡什不像照相馆那样求平求稳，而是大胆处理。他的主光和辅光的光比，有时大到1：3，甚至1：4，有时主光仅仅被用来勾勒出人物的轮廓，人物的面孔大部分虽然处在阴影中，但又有丰富细腻的层次。

在他的镜头下留下过英国文豪萧伯纳、海明威等名人影像，来渥太华的许多名人也都以能让卡什拍摄一张肖像为荣。目前，西方许多著名的艺术博物馆都设立专柜收藏卡什的摄影作品。

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