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  iWiz(2006-09-17 14:28:58, Hit : 6710, Vote : 0
 http://www.iwiz.pe.kr
 http://www.slrclub.com/bbs/vx2.php?id=pentax_forum&no=43369

ij³í°ú ÆæÅ¹½ºÀÇ AF ¹æ½Ä°ú ¼º´ÉÀÇ Â÷ÀÌ


Autofocus is a combination of body and lens, but in a different way for the makers.

(Ä«¸Þ¶ó¿¡¼­) AF(ÀÚµ¿ÃÐÁ¡¸ÂÃß±â) ±â´ÉÀº  ¹Ùµð¿Í ·»ÁîÀÇ »óÈ£Çù·ÂÀ¸·Î ¼öÇàµÇ´Âµ¥ ½ÇÁ¦·Î´Â Ä«¸Þ¶ó ¸ÞÀÌÄ¿ ¸¶´Ù Á¶±Ý¾¿ ´Ù¸£´Ù  

Canon uses an autofocus motor inside the lenses (Nikon uses this technique in many of it's lenses, but not all of them). The Canon mount is purely electric and has no mechanical linkage. But, it isn't the lens that does the thinking, it's the body. The body has the AF processing unit and it controls the lens.

ij³í¿¡¼­´Â ·»Áî ³»ºÎ¿¡ ¼³Ä¡µÇ¾î ÀÖ´Â 1°³ÀÇ AF ¸ðÅ͸¦ »ç¿ëÇÑ´Ù(´ÏÄܵµ ´ëºÎºÐÀÇ ·»Áî¿¡¼­ ij³í°ú °°Àº ¹æ½ÄÀÌ »ç¿ëµÇÁö¸¸ ±×·¸Áö ¾ÊÀº °æ¿ìµµ ÀÖ´Ù).  (AF ±â´ÉÀÇ °æ¿ì) ij³í ¸¶¿îÆ®¿¡¼­´Â (¹Ùµð¿Í ·»Áî »çÀÌ¿¡) Àü±âÀûÀ¸·Î ¿¬µ¿µÇ¾î ÀÖÁö ±â°èÀûÀ¸·Î´Â ¿¬°áµÇ¾î ÀÖÁö ¾Ê´Ù. ±×·¸´Ù°í ÇÒÁö¶óµµ ½ÇÁ¦ AF¸¦ À§ÇÑ °è»êÀº ¹Ùµð°¡ ¼öÇàÇÑ´Ù. Áï ¹Ùµð¿¡ AF ¿¬»ê±â´ÉÀÌ ÀÖ°í ·»Áî´Â ±× °á°ú¸¦ ¹Þ¾Æ AF¸¦ Á¦¾îÇÑ´Ù.    

Pentax system has a mechanical linkage to the lenses. The autofocus motor is inside the body, not in the lens. But, the lenses has an advanced chip and the autofocus system in the body relies on the information it receives from the lens.

À̿ʹ ´Ù¸£°Ô ÆæÅ¹½º AF ½Ã½ºÅÛ¿¡´Â ¹Ùµð¿Í ·»Áî°¡ »óÈ£ ±â°èÀûÀ¸·Î ¿¬°áµÇ¾î ÀÖ´Ù. Áï, AF ¸ðÅͰ¡ ·»Áî ³»ºÎ°¡ ¾Æ´Ï¶ó ¹Ùµð ³»ºÎ¿¡ ¼³Ä¡µÇ¾î ÀÖ´Ù. ´ë½Å ·»Áî ³»ºÎ¿¡ °í±â´É ĨÀÌ ÀÖÀ¸¸ç, ÀÌ Ä¨À¸·ÎºÎÅÍ Á¤º¸¸¦ ¹Þ¾Æ ¹Ùµð ³»ºÎ¿¡ ÀÖ´Â AF ½Ã½ºÅÛÀÌ µ¿ÀÛÇÑ´Ù.

A difference between the Canon system and the Pentax system, is that when the Canon system has calculated how much it needs to turn the lens to achieve the correct exposure, and then turns the lens to that value - it stops there. Now, here's the difference - the Pentax system checks the focus again and make final adjustments.

µû¶ó¼­ ij³í AF ½Ã½ºÅÛ°ú ÆæÅ¹½º AF ½Ã½ºÅÛ »çÀÌ¿¡´Â ´ÙÀ½°ú °°Àº Â÷ÀÌÁ¡ÀÌ ÀÖ´Ù. ij³í AF ½Ã½ºÅÛ¿¡¼­´Â Á¤È®ÇÑ ³ëÃâÀ» ¾ò±â À§ÇØ ·»Áî°¡ À̵¿ÇØ¾ß ÇÒ °Å¸®¸¦ °è»êÇÑ ´ÙÀ½, °è»ê°ª±îÁö ·»Á À̵¿½ÃŰ°í ³ª¸é ·»Áî´Â ±× ÀÚ¸®¿¡ ¸ØÃá´Ù.  ¹Ý¸é¿¡ ÆæÅ¹½º AF ½Ã½ºÅÛ¿¡¼­´Â (ij³í°ú °°ÀÌ AF µ¿ÀÛÀ» ¼öÇàÇÑ ´ÙÀ½) ÀçÂ÷ Çѹø ´õ ÃÊÁ¡À» üũÇÏ¿© ÃÖÁ¾ Á¤¹ÐÁ¶Á¤À» ¼öÇàÇÑ´Ù.

This means that the Pentax system is more accurate than the Canon system, but it is true that the Canon system is faster. Since Pentax checks the focus twice and Canon checks the focus once, the Pentax system needs more time to do it's thing.          

µû¶ó¼­ ÆæÅ¹½º AF ½Ã½ºÅÛÀÌ Ä³³í AF ½Ã½ºÅÛº¸´Ù AF µ¿ÀÛÀº Á¤È®ÇÏÁö¸¸ ´ë½Å¿¡ ºü¸£±â¿¡ ÀÖ¾î ij³í¿¡ ´Ê°Ô µÈ´Ù´Â °ÍÀÌ´Ù. °á±¹ ÆæÅ¹½º¿¡¼­´Â ÃÊÁ¡À» µÎ ¹ø üũÇÏÁö¸¸ ij³í¿¡¼­´Â Çѹø üũÇÏ°Ô µÇ¹Ç·Î ÆæÅ¹½º AF ½Ã½ºÅÛÀÇ ¼Óµµ°¡ ´ÊÀº °ÍÀÌ´Ù.

    

In the 90's, Pentax had the fastest autofocus of all makers - so it's not about the method (in body AF or in-lens AF), it's about power, strength and processing speed. Canon's budget SLR's were always slower than the high-end, even with the same lenses! Why? Since the lenses had their own AF motor, it shouldn't be a difference between the bodies... But it were, because the bodies had different AF processing engines and logics. The budget SLR's from Canon had a simpler AF processning unit, so they had slower AF than the higher-end models.

1990³â´ë¿¡´Â ÆæÅ¹½ºÀÇ AF°¡ ¿©Å¸ Ä«¸Þ¶ó ¸ÞÀÌÄ¿ º¸´Ùµµ °¡Àå »¡¶ú¾úÀ¸¹Ç·Î °á±¹ (AF ¼Óµµ¸¦ Á¿ìÇÏ´Â °ÍÀº) AF ¹æ½Ä(¹Ùµð AF ¶Ç´Â ·»Áî AF)ÀÌ ¾Æ´Ï¶ó AF ¸ðÅÍÀÇ ÆÄ¿ö, °­µµ, AF ¿¬»ê¼Óµµ¶ó°í ÇÒ¼ö ÀÖ´Ù.  ³î¶ø°Ôµµ ij³íÀÇ Àú¿¹»ê SLRÀÇ AF ¼Óµµ°¡ µ¿ÀÏÇÑ ·»Á »ç¿ëÇÏ´Â ÇÏÀÌ¿£µå SLR º¸´Ù Ç×»ó ´Ê´Ù. ¿Ö..??  Ä³³í ·»Á´Ù AF ¸ðŸ°¡ ³»ÀåµÇ¾î Àֱ⠶§¹®¿¡  ¹ÙµðƯ¼º°ú´Â ¾Æ¹« »ó°üÀÌ ¾ø¾î¾ß Çϴµ¥ ½ÇÁ¦·Î´Â Â÷À̰¡ ÀÖ¾ú´Ù.  ¿Ö³ÄÇÏ¸é ¹Ùµð¸¶´Ù AF ¿¬»ê¿£Áø°ú ·ÎÁ÷ÀÌ ´Ù¸£±â ¶§¹®ÀÌ´Ù.  ½ÇÁ¦·Î ij³íÀÇ Àú¿¹»ê SLR¿¡´Â ÇÏÀÌ¿£µå Ä«¸Þ¶óº¸´Ù ´Ü¼øÇÑ AF ¿¬»ê À¯´ÏÆ®¸¦ °¡Áö°í Àֱ⠶§¹®¿¡  AFÀÇ ¼Óµµ°¡ ´ÊÀ» ¼ö ¹Û¿¡ ¾ø´Ù.      

In digital SLR's Pentax has got a bad reputation of slow autofocus, mainly because Pentax choosed a weak autofocus motor in their budget SLR's in order to be able to sell the cameras at a low price. (and as you now understand, Canon has done a similar thing, but in their case it wasn't the AF motor, it was the AF processing unit that was weak).

µðÁöÅÐ ÆæÅ¹½º SLR¿¡´Â AF ¼Óµµ°¡ ´Ê´Ù´Â ³ª»Û ÆòÆÇÀ» ´Þ°í ´Ù´Ï´Â µ¥, ±× ÁÖ¿ä ÀÌÀ¯´Â DSLRÀÇ °¡°ÝÀ» ³·Ãß±â À§ÇØ Àú¼º´ÉÀÇ AF ¸ðÅ͸¦ »ç¿ëÇÏ¿´±â ¶§¹®ÀÌ´Ù. (¿©·¯ºÐµéÀÌ ÀÌÇØÇϰí ÀÖµíÀÌ Ä³³íµµ ºñ½ÁÇÑ Çຸ¸¦ º¸¿´Áö¸¸ ij³íÀÇ °æ¿ì AF ¸ðÅͰ¡ ¾Æ´Ï¶ó  AF ¿¬»ê±â´ÉÀ» ¶³¾î¶ß·È´Ù.)(¿ªÀÚÁÖ: AF ¸ðÅͰ¡ ·»Áî¿¡ ÀÖÀ¸¹Ç·Î ·»Áî ¸ðÅ͸¦ ¼Õ´î ¼ö¾ø±â ¶§¹®¿¡)

With the K100D, Pentax has put in a stronger, faster autofocus motor, the AF processing unit is also faster. This means that the K100D is faster than previous budget DSLR's from Pentax, especially with long and heavy lenses.

K100DÀÇ °æ¿ì, ÆæÅ¹½º¿¡¼­´Â ¹Ùµð ³»ºÎ¿¡ Á»´õ °­ÇÏ°í ºü¸¥ AF ¸ðÅ͸¦ ÀåÂøÇÏ¿´°í µ¿½Ã¿¡ AF ¿¬»ê À¯´ÏÆ®ÀÇ ¼Óµµµµ ºü¸£°Ô Çß´Ù. ÀÌ ÀÇ¹Ì´Â ÆæÅ¹½º Ãâ½ÃµÈ ¿©Å¸ DSLR º¸´Ù AF ¼Óµµ°¡ »¡¶óÁ³´Ù´Â °ÍÀÌ¸ç Æ¯È÷ ±æ°í ¹«°Å¿î ·»Áî¿¡¼­ ´õ ½±°Ô ü°¨ÇÒ °ÍÀÌ´Ù.



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