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Imaging Resource interviewed Sony engineer and manager Kimio Maki. The main talk was the new 42MP sensor and here are some key answers:
À̹Ì¡ ¸®¼Ò½º´Â ÃÖ±Ù ¼Ò´Ï ¿£Áö´Ï¾îÀÌÀÚ ¸Å´ÏÀúÀÎ ¸¶Å° Å°¹Ì¿À¾¾¿ÍÀÇ ÀÎÅͺ並 ÁøÇàÇÏ¿´½À´Ù. ÁÖ ÈÁ¦´Â ¿ª½Ã³ª ½Å°³¹ß 4200¸¸ È¼Ò ¼¾¼¿´°í, ±× Çٽɳ»¿ëÀº ¾Æ·¡¿Í °°½À´Ï´Ù:
1) Why 42MP: 42-megapixel was the best pixel size to realize 4K movies. Super 35mm gives the best picture quality, from oversampling 15 megapixels down to the eight-megapixel 4K size. The picture quality is better than a professional video camera.
1) ¿Ö 4200¸¸ ȼÒÀΰ¡: 4200¸¸ ȼҶó´Â °ÍÀº ÇöÀç 4K µ¿¿µ»óÀ» ±¸ÇöÇϱ⿡ °¡Àå ÀÌ»óÀûÀΠȼÒÀÔ´Ï´Ù. ¼öÆÛ 35mm¸ðµåÀÇ °æ¿ì °¡Àå ÁÁÀº ÈÁúÀ» º¸¿©ÁÖ¸ç, ÀÌ´Â 800¸¸ ȼҰ¡ ¿ä±¸µÇ´Â 4K µ¿¿µ»óÀÇ ¿ä±¸Á¶°Ç ´ëºñ ¾à 1.8¹èÀÎ 1500¸¸ ȼҷΠ¿À¹ö »ùÇøµ ÇÏ¿© ´Ù¿î»çÀÌÁî Çϱ⠶§¹®ÀÔ´Ï´Ù. ÈÁúÀº ÇöÀç ÇÁ·ÎÆä¼Å³Î ºñµð¿À Ä«¸Þ¶óº¸´Ù ÈξÀ ³´½À´Ï´Ù.
2) Noise improvement: in terms of ISO, this sensor’s sensitivity is better than 36-megapixel chips. The A7R Mark II has better noise performance; better than the A7R.
³ëÀÌÁî °³¼±: ISO¿¡ °üÇÏ¿©, ÀÌ ¼¾¼ÀÇ °¨µµ´Â ¿ÀÈ÷·Á 3600¸¸ ȼÒÀÇ ¼¾¼º¸´Ù ³´½À´Ï´Ù. A7R Mark II´Â A7Rº¸´Ù ´õ ³ªÀº ³ëÀÌÁî ÆÛÆ÷¸Õ½º¸¦ º¸¿©ÁÝ´Ï´Ù.
3) Why not 50MP: But 42 (MP) is not a good word. But actually, the engineers said “if you prefer 50, you have to lose sensitivity”. Of course 50 [would] give better resolution, and 45 would be more impressive, but it wouldn’t be perfectly balanced.
¿Ö 5000¸¸ ȼҰ¡ ¾Æ´Ñ°¡: ¹¹, 4200¸¸ ȼҿ¡ ¸¸Á·ÇϽÃÁö ¾ÊÀ» Áö ¸ð¸¨´Ï´Ù. ±×·¯³ª »ç½Ç, ¿ì¸® ¿£Áö´Ï¾îµéÀÌ ¸»Çϱ⸦, "5000¸¸ ȼҸ¦ ¿øÇÑ´Ù¸é ¿ÀÈ÷·Á °¨µµ¿¡¼ ¼ÕÇظ¦ º¼ °ÍÀÌ´Ù" ¶ó°í ÇÏ´õ±º¿ä. ¹°·Ð 5000¸¸ ȼҴ ´õ ³ªÀº Çػ󵵸¦ º¸ÀåÇÕ´Ï´Ù, ±×¸®°í 4500¸¸ ȼҵµ ´õ ³ªÀ» ¼öµµ ÀÖ°ÚÁÒ, ±×·¯³ª ³ëÀÌÁî¿ÍÀÇ ¹ë·±½º¸¦ °í·ÁÇϸé ÀÌ»óÀûÀΠȼҴ ¾Æ´Õ´Ï´Ù.
4) Advantages of backside illuminated sensors: in order to realize this kind of sensitivity, we have to prefer backside-illuminated. That’s the first priority, to gather lots of light, more light, effectively. The other decision was in the wiring layers; we used to use the aluminum, but aluminum is not good enough to transfer the data faster. Therefore we change the material from the aluminum to the copper to make it faster. [Ed. Note: Copper is more conductive than aluminum, so there’s less resistance in the circuit lines on the chip, meaning signals can propagate faster.] Therefore, then we could get a faster transition from the light to an electrical signal.
4) À̸éÁ¶»çÇü ¼¾¼ÀÇ ÀåÁ¡: ÀÌÁ¤µµ ¼öÁØÀÇ °¨µµ¸¦ ±¸ÇöÇϱâ À§Çؼ, ¿ì¸®´Â À̸éÁ¶»çÇü ¼¾¼¸¦ ¼±ÅÃÇÒ ¼ö ¹Û¿¡ ¾ø¾ú½À´Ï´Ù. ¼¾¼ °³¹ß½Ã ÃÖ¿ì¼±°úÁ¦´Â ´õ ¸¹Àº ºûÀ» ¹Þ¾ÆµéÀÌ°í, ´õ È¿°úÀûÀ¸·Î Àß ¹Þ¾ÆµéÀÏ ¼ö Àִ°¡¿´½À´Ï´Ù. ±×¸®°í ¶Ç ´Ù¸¥ ¿ä¼Ò´Â ¹è¼±ÀÇ ¹®Á¦¿´½À´Ï´Ù. ¿ì¸®´Â ÀÌÀü¿¡ ¾Ë·ç¹Ì´½ ¹è¼±À» »ç¿ëÇß½À´Ï´Ù¸¸ ÀÌ ¾Ë·ç¹Ì´½À̶ó´Â °ÍÀÌ µ¥ÀÌÅÍ Àü¼Û ¼Óµµ¿¡´Â ÀûÇÕÇÏÁö ¾Ê¾Ò½À´Ï´Ù. ±×¸®ÇÏ¿© ¿ì¸®´Â ´õ ºü¸¥ µ¥ÀÌÅÍ Àü¼Û¼Óµµ¸¦ À§ÇØ ¾Ë·ç¹Ì´½ ±Ý¼Ó¼ÒÀ縦 ´ë½ÅÇÏ¿© ±¸¸®¹è¼±À» äÅÃÇß½À´Ï´Ù. [ÆíÁýÀÚ ÁÖ: ±¸¸®´Â ¾Ë·ç¹Ì´½º¸´Ù ´õ Àüµµ¼ºÀÌ °ÇϹǷΠ¼¾¼Ä¨¿¡¼ ¹è¼±À» ±¸¼ºÇÒ °æ¿ì ´õ ÀúÇ×ÀÌ Àû´Ù. µû¶ó¼ ½ÅÈ£´Â ´õ »¡¸® Àü´ÞµÉ ¼ö ÀÖ´Ù.] ±×¸®ÇÏ¿© ¿ì¸®´Â ºûÀÇ ½ÅÈ£¸¦ Àü±â½ÅÈ£·Î ´õ ºü¸£°Ô ¹Ù²ã Àü¼ÛÇÒ ¼ö ÀÖ°Ô µÇ¾ú½À´Ï´Ù.
5) Uncompressed RAW: Sony RAW is compressed, not uncompressed. But if we’re getting a lot of requests for it, we should make such a kind of no-compression raw. We recognize the customer’s requirement, and actually we are working on it. And yes Sony could provide that via simple firmware upgrade!
ºñ¾ÐÃà RAW: ¼Ò´Ï RAW´Â ºñ¾ÐÃàÀÌ ¾Æ´Ñ ¾ÐÃàÆ÷¸ËÀÔ´Ï´Ù. ±×·¯³ª À¯ÀúµéÀÌ ºñ¾ÐÃàÀ» ¿øÇÑ´Ù¸é ´ç¿¬È÷ ¿ì¸®´Â ±×·¯ÇÑ ºñ¾ÐÃà RAW Æ÷¸ËÀÇ »çÁøÀúÀå ±â´ÉÀ» ¸¸µé°ÍÀÔ´Ï´Ù. ¿ì¸®´Â °í°´ÀÇ ¿ä±¸¸¦ ÀÎÁöÇÏ°í ÀÖÀ¸¸ç, »ç½Ç ÀÌ ºñ¾ÐÃà RAW¿¡ ´ëÇØ ÀÛ¾÷ÁßÀÔ´Ï´Ù. ¿¡ÀÕ, ±îÁþ°Å! ¼Ò´Ï´Â °£´ÜÇÑ Æß¿þ¾î ¾÷±×·¹À̵带 ÅëÇØ ÀÌ ±â´ÉÀ» Á¦°øÇϵµ·Ï ÇÏ°Ú½À´Ï´Ù.
6) Hybrid Autofocus: in terms of autofocus, we are using a hybrid focus, so first we use the phase-detection focus to get close to the object. Then near the object, we start to use contrast AF to get a clear peak. Then we adjust the focus. Then in order to make very precise focus (because 42-megapixel means very very small pixels), and also the focusing point could be a very small one, therefore we phase-detection together with contrast AF, contrast focus.
6) ÇÏÀ̺긮µå AF: AF¿¡ °üÇÏ¿©, ¿ì¸®´Â ÇöÀç ÇÏÀ̺긮µå ¹æ½ÄÀÇ AF¸¦ ±¸ÇöÇÏ°í ÀÖ½À´Ï´Ù. µû¶ó¼ ù¹ø°·Î, ÀÌ ½ÅÇü ¼¾¼´Â À§»óÂ÷ °ËÃâ ÃÊÁ¡±â´ÉÀ» ¿ì¼± »ç¿ëÇÏ¿© ÇÇ»çü¿¡ ÃÊÁ¡À» Á¢±Ù½Ãŵ´Ï´Ù. ±× ´ÙÀ½ ¸ñÇ¥¿¡ ÃÊÁ¡ÀÌ °ÅÀÇ ¸Â°Ô µÇ¸é ÄÁÆ®¶ó½ºÆ® AF·Î ÀüȯµÇ¿© Á¤È®ÇÑ ÃÊÁ¡À» ±¸ÇöÇϵµ·Ï ¼³°èÇß½À´Ï´Ù. ÃÊÁ¡Àº Á¶Á¤µË´Ï´Ù. ¶ÇÇÑ ¸Å¿ì ³ôÀº Á¤¹ÐµµÀÇ ÃÊÁ¡ÀÇ Á¤È®¼ºÀ» À§ÇØ (¿Ö³ÄÇϸé 4200¸¸ ȼҴ ±× ȼҰ¡ ³Ê¹« À۾Ƽ Á¤¹ÐÇØ¾ß ÇÕ´Ï´Ù), Æ÷Ä¿½Ì Æ÷ÀÎÆ®´Â ¸Å¿ì ÀÛÀº Å©±â·Î ¼³°èÇßÀ¸¸ç, ±× °á°ú À§»óÂ÷ °ËÃâ°ú ÄÁÆ®¶ó½ºÆ® AF¸¦ µ¿½Ã¿¡ ±¸ÇöÇÒ ¼ö ÀÖ°Ô µÈ °ÍÀÔ´Ï´Ù.
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