Cooke Speed Panchro 第一代,在全片幅拍攝時會有暗角..............為甚麼第一代Cooke Speed Panchro全片幅拍攝時會有暗角 ?
根據網站上的Cooke官方資料................."By 1935 the Cooke Speed Panchros for cinematography were supplied in 8 focal lengths working at f/2.0: 24, 28, 32, 35, 40, 50, 75 and 108mm. They were designed to cover standard format 0.631 x 0.868 inch.
譯 : 產於1936年的第一代Cooke Speed Panchro 當中包括全為光圈2.0 的 24, 28, 32, 35, 40, 50, 75 and 108mm 是以應付0.631 x 0.868 吋的標準格式。
講法來自以下網頁
http://lovefool-tai.blogspot.hk/2013/03/cooke-speed-panchro-50mm-f2-ser-i.html