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Keywords: Long Short Focus 1866.jpg An early calculation of CoC diameter indistinctness by T H in 1866 Circle of confusion Perhitungan awal diameter CoC indistinctness oleh T H pada tahun 1866 1866å¹´æ¨¡ç³Šå ˆæ–‡ç« en wikipedia 1866 T H bRITISH JOURNAL OF PHOTOGRAPHY 1866 PD PD-old Check categories 2008 November 19 en wikipedia Circle_of_confusion zh wikipedia æ¨¡ç³Šå ˆ Photography Optics History of photography |