¿Ã¸²Çª½º Photo&TalK |
http://www.photozone.de/m43/961_olympus714f28pro
ÃÊÁ¡Æò¸é»óÀÇ MTF°ª :
7mm¿¡¼ÀÇ »ó¸é¸¸°î :
Testing the effects of field curvature is notoriously unreliable so take the following with a grain of salt. In the previous chapter we illustrated the MTFs when following the field curvature across the image field. In this chapter we analyse the flat field reproduction at 7mm. The field curvature is, of course, most obvious at fully open aperture - essentially we are documenting the related local out-of-focus effects here. The center quality remains identical, of course, but the corner quality falls completely apart at f/2.8 and f/4. The increased depth-of-field catches up at f/5.6 although the max MTFs on the actual focus field cannot be reached even at f/8.
»ó¸é¸¸°îÀ» MTFÂ÷Æ®·Î Å×½ºÆ®ÇÏ´Â °ÍÀº ¾ÆÁÖ ´ë´ÜÈ÷ ±²ÀåÈ÷ ½Å·Ú¼º ¾øÀ¸¹Ç·Î, Àû´çÈ÷ µé¾î¶ó. ÃÊÁ¡¸éÀÌ ¾Æ´Ñ Æò¸é¿¡ ´ëÇÑ MTF ÃÔ¿µÀ» ÁøÇàÇϸé ÀÌ ·»ÁîÀÇ ±¤°¢´Ü¿¡¼ »ó¸é¸¸°îÀÌ ¾ó¸¶³ª °ÇÑÁö¸¦ º¼ ¼ö ÀÖ´Ù. ´ç¿¬È÷ »ó¸é¸¸°îÀÇ È¿°ú´Â ÃÖ´ë°³¹æ¿¡¼ °¡Àå °ÇÏ´Ù. (»ç½Ç ¿ì¸®´Â °ü·ÃµÈ out-of-focus È¿°ú¿¡ ´ëÇÑ ±ÛÀ» ¾²°í Àֱ⵵ ÇÏ´Ù) Á߾ӺΠÇØ»ó·ÂÀº ´ç¿¬È÷ À¯ÁöµÇÁö¸¸, ÁÖº¯ºÎ ÈÁúÀº f/2.8°ú f/4¿¡¼ È®¿¬È÷ ¶³¾îÁ® º¸ÀδÙ. Á¶¸®°³¸¦ Á¶Àϼö·Ï ½Éµµ°¡ ±í¾îÁö¹Ç·Î f/5.6¿¡¼´Â ÁÖº¯ºÎ°¡ »ó´çÈ÷ ȸº¹µÇÁö¸¸, f/8±îÁöµµ ÁÖº¯ºÎ ÈÁúÀ» 100% ȸº¹ÇÏÁö ¸øÇÏ°í ÀÖ´Ù.
Now what does this mean in the real life rather than in the lab ? For best performance (edge to edge sharpness in an "infinity" scene) you should stop down to f/8 and pull the focus slightly towards you (towards closer focus distance). This will pull the corners into focus.
±×·¯´Ï±î ÀÌ°ÍÀÌ Å×½ºÆ® Â÷Æ®°¡ ¾Æ´Ñ ½ÇÁ¦ »ç¿ë¿¡¼ ¹«¾ùÀ» ÀǹÌÇϴ°¡? ÃÖ´ëÇÑÀÇ ¼º´ÉÀ» ³»±â À§Çؼ´Â (¹«ÇÑ´ë ÃÔ¿µ¿¡¼ È¸é ³¡ºÎÅÍ ³¡±îÁö »þÇÁÇÑ °á°ú¸¦ ¾òÀ¸·Á¸é) Á¶¸®°³¸¦ f/8±îÁö Á¶ÀÌ°í ÃÊÁ¡À» ¾à°£ ÃÔ¿µÀÚ ÂÊÀ¸·Î (¾à°£ °¡±î¿î ÂÊÀ¸·Î) ´ç°Ü¾ß ÇÑ´Ù. ÀÌ·¸°Ô Çϸé ÁÖº¯ºÎ°¡ ÇÇ»ç°è½Éµµ ¿µ¿ª¿¡ µé¾î¿Ã °ÍÀÌ´Ù.
°á·Ð :
Optical Quality
Mechanical Quality
Price/Performance
The Olympus M.Zuiko 7-14mm f/2.8 PRO left a bit of a mixed impression. Actually prior of this test I took it on vacation but the results were a bit short of my expectation - primarily because of the field curvature issue at 7mm which I didn't know about at the time. When keeping the field curvature in mind and act accordingly, you can certainly achieve very good results. The center quality is breathtaking whereas the outer image region has be handled with care when shooting below 10mm at least (pull the focus a bit). Image distortions aren't relevant from a user perspective. That being said it is also obvious that the auto-correction comes at the price of a bit of softness - it is simply not lossless. Vignetting as well as lateral CAs are a lesser concern. Despite its immense front element it is also worth to emphasize that the M.Zuiko is surprisingly flare-resistant (relative to others in this class).
¿Ã¸² 7-14/2.8 PRO¿¡ ´ëÇÑ º»ÀÎÀÇ ÀλóÀº ´Ù¼Ò ¸ðÈ£ÇÏ´Ù. »ç½Ç Å×½ºÆ®¸¦ ¹úÀ̱â Àü¿¡ ÈÞ°¡¸¦ °¡¸é¼ ÀÌ ·»Á °¡Á®°¬°í, °á°ú¹°Àº ¿¹»óº¸´Ù ÁÁÁö ¾Ê¾Ò´Ù. ±× ¶§´Â ÀÌ ·»Áî°¡ ±¤°¢´Ü¿¡¼ »ó¸é¸¸°îÀÌ ÀÖ´Ù´Â °ÍÀ» ¸ô¶ú±â ¶§¹®ÀÌ´Ù. ¹°·Ð ÀÌ Æ¯¼ºÀ» ¾Ë°í ÀûÀýÈ÷ ´ëÀÀÇÏ¸é ¸Å¿ì ÁÁÀº °á°ú¹°À» ¾òÀ» ¼ö ÀÖ´Ù. 10mm ¹Ì¸¸¿¡¼ ÃÔ¿µÇÒ ¶§ ÁÖº¯ºÎ¸¦ ½Å°æ½á¼ ÃÊÁ¡À» Á¶ÀÛÇØ¾ß ÇÑ´Ù´Â Á¡¿¡µµ ºÒ±¸ÇÏ°í Á߾ӺΠÈÁúÀº ¸Å¿ì ÁÁÀ¸¸ç »ç¿ëÀÚ ÀÔÀå¿¡¼ ¿Ö°îÀº ½Å°æ¾²ÀÌÁö ¾Ê´Â´Ù. ¹°·Ð ÀüÀÚ½Ä ¿Ö°îº¸Á¤ÀÌ »þÇÁÇÔÀ» ¼Õ»ó½ÃÅ°´Â Á¡Àº ºÐ¸íÇÏ´Ù. - ÀÌ´Â ¹«¼Õ½Ç º¸Á¤ÀÌ ¾Æ´Ï´Ï±î. ºñ³×ÆÃÀ̳ª »ö¼öÂ÷´Â º°·Î Áß¿äÇÏÁö ¾ÊÀº ¹®Á¦ÀÌ´Ù. ¶ÇÇÑ ´ë¹°·»Áî°¡ °Å´ëÇÔ¿¡µµ ºÒ±¸ÇÏ°í 7-14/2.8ÀÌ Ãʱ¤°¢ ÁÜ·»Áîµé Áß¿¡¼ Ç÷¹¾î¿¡ ¸Å¿ì °ÇÏ´Ù´Â Á¡µµ °Á¶Çؾ߰ڴÙ.
In terms of build quality, the Olympus is up there with the very best and it's a joy to use in the real life. The noiseless and fast AF are something we got used to in the Olympus universe but it's worth to mention nonetheless.
¸¸µê»õ ¸é¿¡¼ ÀÌ ¿Ã¸²Çª½º ·»Áî´Â ¸Å¿ì ÈǸ¢ÇÏ¸ç »ç¿ëÇÏ¸é¼ Áñ°Å¿î Á¡ Áß ÇϳªÀÌ´Ù. Á¶¿ëÇÏ°í ºü¸¥ AF´Â ¿Ã¸²Çª½º Á¦Ç°µé¿¡¼ ¸Å¿ì ÀϹÝÀûÀÌÁö¸¸ ¿ª½Ã ¾ð±ÞÇØ¾ß µÇ°Ú´Ù.
At the end of the day, there is, of course, the big question whether to prefer the Olympus M.Zuiko 7-14mm f/2.8 PRO over the Panasonic Lumix G 7-14mm f/4 ASPH. The Olympus lens is obviously faster so if low light shooting is your thing, this is obviously already the answer. However, in my case the Panasonic lens will remain in my stock because of its smaller size and better field curvature.
¹°·Ð Æijª¼Ò´ÐÀÇ 7-14/4¿Í ¿Ã¸²Çª½º 7-14/2.8 Áß¿¡ ¾î¶² °ÍÀ» °ñ¶ó¾ß ÇÏ´À³Ä´Â Áú¹®ÀÌ ³²´Â´Ù. ´ç¿¬È÷ ¾îµÎ¿î °÷¿¡¼ ÃÔ¿µÇÒ ¶§´Â ÇÑ ½ºÅ¾ ºü¸¥ ¿Ã¸²Çª½º ·»Áî°¡ ÁÁ°ÚÁö¸¸, º»ÀÎÀº Æijª¼Ò´Ð ·»ÁîÀÇ ´õ ÀÛÀº Å©±â¿Í ÈξÀ ³ªÀº »ó¸é¸¸°î Ư¼º ¶§¹®¿¡ ±× ·»Á °è¼Ó °¡Áö°í ÀÖÀ» °ÍÀÌ´Ù.
____
±¤°¢´Ü »ó¸é¸¸°îÀÌ ±²ÀåÇÑ ·»ÁîÀε¥ ±×°ÍÄ¡°í ÈÁú ÆòÁ¡ÀÌ °úºÐÇÕ´Ï´Ù. ´Ù¸¥ PROµéº¸´Ù ³·±ä ÇÏÁö¸¸¿ä.
F2.8 ¶§¹®¿¡ ¸¹Àº °É Æ÷±âÇÑ ´À³¦À̶ö±î.... Photozoneµµ ¿äÁò ¸®ºä ¹°··ÇÏ°Ô Çϳ׿ä.
»ó´ë¿¡°Ô »óó¸¦ Áֱ⺸´Ù´Â °°ÀÌ Áñ°Å¿ö ÇÒ ¼ö ÀÖ´Â ¸ÚÁø ÄÚ¸àÆ® ºÎŹµå·Á¿ä.
»ó´ë¹æ¿¡ ´ëÇÑ ºñ¹æÀ̳ª ¿å¼³µî ºÎÀûÀýÇÑ ÄÚ¸àÆ®ÀÇ °æ¿ì ¿î¿µÁøÀÇ ÆÇ´ÜÇÏ¿¡ »èÁ¦µÉ ¼ö ÀÖÀ¸´Ï ÁÖÀÇ ºÎŹµå¸³´Ï´Ù.
¼Ò¼È ·Î±×ÀÎ ³²°ÜÁֽŠÀÇ°ßÀº ÆËÄÚ³Ýȸ¿ø ºÐµé¿¡°Ô Å« º¸ÅÆ°ú ÈûÀÌ µË´Ï´Ù. »õ·Î°íħ |