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¤£¹L³Ìªñ¬Ý¨ì theatre of noise ¤E¤ë¥÷¦³¤@½g¤å³¹¡G¡uWhich Medium Film Format?¡v¡A¸ÌÀY´£¨ì 35mm Normal Lens (¼Ð·ÇÃè) ªºµJªøÀ³¬° 43mm¡A¤Þµo§Ú¹ï³o­ÓÃD¥Øªº¿³½ì¡A¦]¦¹¦bºô¸ô¤W§ä¤F¤@¨Ç¸ê®Æ¡A¨ä¤¤ wiki ¦³¤@½g Normal Lens¡A«Ü§¹¾ã¡A§Ú·QÀ³¸Ó«Ü¦³°Ñ¦Ò»ù­È¡A¤j®a¥i¥H¬Ý¬Ý¡C

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A lens that generates images that generally look "natural" to a human observer under normal viewing conditions, as compared with lenses with longer or shorter focal lengths. Lenses of shorter focal length are called wide-angle lenses, while longer focal length lenses are often referred to as telephoto lenses.

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A lens with a focal length about equal to the diagonal size of the film or sensor format is known as a normal lens; its angle of view is similar to the angle subtended by a large-enough print viewed at a typical viewing distance equal to the print diagonal; this angle of view is about 53 degrees diagonally.

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Oskar Barnack (Leica Camera ªº³]­pªÌ) ¿ï¥Î 50mm ªº­ì¦], ¬O¥H·í®ÉªºÃèÀY¬ì§Þ, »{¬°³]­p¦¨²¤ªøµJªøªºÃèÀY¥i¥H¹F¨ì³Ì¨Îªº²M´·«×, ©ó¬O¦b²z½×­È 43mm »P¨D±o¨}¦n²M´·«×¤§¶¡©Ò°µªº§´¨ó¡C

The 50 mm focal length was chosen by Oskar Barnack, the creator of the Leica camera, as a compromise between the theoretical value and good sharpness, as lens technology at the time was such that slightly longer focal lengths were able to achieve optimum sharpness.

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FA_43mmF1.9¦bÁÙ¨S¥þ³¡³£À´¤§«e¡A¤j·§¥i¥H»¡¡A¤@¯ë¦U®a©Ò¥Xªº¼Ð·ÇÃè¡A¬O¥H±µªñ¤HÃþÆ[¹îµø³¥°µ¬°Åý¤j®a¯à°÷À´ªº©w¸q¡AµM¦Ó¥¿½T©Î»¡µ´¹ïªº¼Ð·ÇÃè©w¸q¡AÀ³¸Ó¬OÃèÀY±N¼v¹³§ë¬M©ó©³¤ù©Î·P¥ú¤¸¥ó®É¡A¦U¼v¹³ªº¤ñ¨Ò»P¯u¹ê¼v¹³³Ì±µªñ¡Awiki ¤W¥Îªº¬O ¡uNatural¡v ³o­Ó¦r²´¡C

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³Ì«á¤£§Ñ´£¤@¤U Pentax ªº¤j¤½¥D¡GFA 43mm F1.9 Limited¡A¬O¥þ¥@¬É°ß¤@¤@¤ä¡A¥HµJ¶Zµ¥©ó©³¤ù¹ï¨¤½u¤Ø¤o¡A¯u¥¿·N¸q¤Wªº¼Ð·ÇÃèÀY©Ò³]­pªº¦Û°Ê¹ïµJÃèÀY¡CÁöµM FA Ãè¥þ­±º¦»ù¤F¡A¦ý§Ú²{¦b·Q¥h·d¤@Áû 43 LE ¨Ó¤F¡I

 

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