人像之王：AF DC 135mm f/2D DC 105mm f/2D


精湛的DC（Defocus-image Control）散焦影像控制技术是尼康的独门绝学之一，迄今为止，尼康仅在两支顶级定焦产品上应用了这项技术，这两个幸运儿分别是AF DC 135mm f/2D和AF DC 105mm f/2D
相比之下，AF DC 135mm f/2D拥有更长的焦距和自由度更高的画面裁切力，因此他也更受到职业摄影师们喜爱他7片6组的光学结构简洁而成熟，815克的重量显示出使用了真材实料的纯金属材质，79×120mm的镜体上被覆以豪华精美的黑色皱纹烤漆涂层
尼康DC散焦控制系统在控制焦外结像风格方面具有无以伦比的优势，这为AF DC 135mm f/2D成为一代人像王者提供了先天技术支持，而且尼康还根据这支镜头所涉创作题材方面的需要，在通光孔径镀膜工艺阻尼手感等项目上进行了高标准设计该头非常适宜从事自然环境中的室外人像摄影，他焦内锐利明澈，焦外圆润柔美，所摄取的环境人像作品充满了浪漫的诗情画意尼康AF DC 135mm f/2D是一支毫无争议的高素质人像之王，他专精而充满个性，如果您想像艺术大师一样掌控所有的影像细节，那就马上花费将其收入囊中吧
NIKON的技術稱為DEFOCUS IMAGE CONTROL，AF DC-Nikkor 鏡頭能精確的控制背景及前景的模糊程度，尤其是在人像攝影時的效果特別突出，
使用方法：
當使用 DEFOCUS IMAGE CINTROL時，只要鏡鏡頭前端的DEFOCUS IMAGE CINTROL控制環卡筍按下後轉動控制環，即可改變背景及前景的模糊程度, 控制環上印有 F 5.6,4,2.8,2 I 2,2.8,4,5.6 R字樣, I 表示關閉，I以左的F表示前景控制I以右的R表示背景控制實際使用時在鏡頭中是看不到模糊的程度，必須要相片沖出來之後才知道效果如何！使用時要先將所要的背景及前景的模糊程度調整好，再對主體對焦若在對焦完成後才調整背景及前景的模糊程度，會造成原先對好的主體失焦
除此之外AI AF DC Nikkor 105mm F2D還使用Rear Focusing技術，使用了鏡片群的後組來對焦，一般這種技術是使用在需要高速對焦的望遠鏡頭，這種技術可使對焦更迅速更順暢，也提昇了較佳的光學效能
105mm的焦距很適於做人像拍攝及特寫，DC 的特殊效果用在風景攝影時也是別具風味
尤其是F2.0大光圈再加上DEFOCUS IMAGE CONTROL的散景控制，那各位可以想像F2.0的景深本來就很短，若是又可以控制這個景深那不是很有用嗎？
當前景或背景的模糊可以被控制的時候，整個畫面的主體就跳脫出來，更有立體感！
AI AF DC Nikkor 105mm F2.0D的鏡身塗裝除了AIS鏡頭上慣有的那個白色鋁圈
外，使用噴沙的黑點塗裝來增加他的手握質感，對焦環寬大，對焦阻尼控制良好，手動對焦時，感覺很棒
手動對焦使用NIKON慣用的A-M切換按鈕，與小黑等AF鏡頭相同
F2.0的大光圈，是你在微光中，舞台攝影夜間攝影街頭速寫的最佳武器
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镜头介绍：
AF DC Nikkor 105mmf/2D RF SIC
镜组结构：6组6片（比135DC少1片，无ED无非球面镜片）
最小光圈:F16
光圈叶数：９
最近对焦距离：0.9米（比85/1.4远5厘米，比135DC近20厘米）
放大比: 1:7.7(介于135DC的 1:7.1和85/1.4的1:8.8之间,术业有专攻,喜欢拍花花草草的还是选105/2.8Macro吧 
滤镜尺寸72毫米（同135DC,比85/1.4小5毫米，略省些滤镜钱呵呵）
遮光罩内置
重量：640g （比85/1.4重90g,比135DC轻175g)
尼康自己的描述：
有散焦控制的标准人像镜头
快速中距远摄镜头带有散焦控制
特大光圈允许暗光下拍摄
圆形光圈叶片使散焦景物更自然
RF（后组对焦）技术使AF操作更快速
SIC: 尼康超级综合镀膜的缩写
Photodo评分:4.2
[转:西平英生的评价]
世界第一支装有控制浅景深效果的DC系统的望远镜头就是Nikon的DC( Defocus Image Control)镜头，这个划时代的镜头只要调节DC环就可控制浅景深，可拥有不同感觉的多姿多彩的影像效果. DC135mmF2早在1991年上市即深获好评，这支DC105mmF2镜头属于DC镜头的第二代，才用比老大哥级的135毫米更好用的，适合人物摄影的105毫米
镜片组合是6片6组（不含1片后组保护镜片），对焦是后组对焦方式，合焦迅速，此外不仅是DC系统，还采用了适宜展现浅景深效果的9片圆形光圈
NikonDC镜头的浅景深效果控制系统是通过调整像差状态，将DC环转到R(后）侧时设定后景深，转到F（前）设定前景深，也可以微调DC环来精细调整浅景深的效果
解像力测试数据表明中心到画面四周都十分良好，与135F2DC非常接近，实拍测试时光圈全开，几乎没有周边失光的现象，畸变控制极好，虚化效果柔和自然
105DCF2是135DCF2的兄弟，发布时间晚了两年，是在人像镜头的焦距越来越短，逐渐从长焦向中焦靠拢这样的大趋势下出炉的，一方面摄影师在室内工作时可以更佳灵活的构图，而另一方面也方便了摄影师和模特之间的交流与沟通
和135DCF2相比，105DC的光学结构略有变化，从7片6组变成了6片6组，但像质因此而变得更加优秀而用料和做工上则依然保持了较高的水平
抛开DC功能不看，105DCF2的光学表现极为犀利，即使是在以锐著称的nikkor镜头中，105DC F2的锐度也是首屈一指的，由于是专为人像设计的镜头，105DC F2的中心解像力水平几乎超越边缘解像力2倍以上，这非但未对整支镜头的表现有任何损害，反而带来了背景虚化更柔和的好处 让人不得不赞叹设计师的匠心独具，9片的光圈叶片使得焦外成像犹如丝绸一般，即使是菜鸟拿到105DC F2，相信也能拍出不错的作品
Nikkor 105mm f/2D DC是挪威著名摄影家兼尼康器材测试专家Bjorn Rorslett评价最高也最喜欢的一只镜头他对尼康的所有镜头做过测试，一般都写下简洁的评语，只有对105mm f/2D DC的评语写得最长，而且毫不吝啬赞美之词下面是他评语的原文：
105mm f/2D DC AF: 5
The 105/2 is the shorter of the two Nikkors offering a defocus control (DC) feature, and possibly a better performer than the longer 135/2 DC.（此处说105DC胜过135DC）In fact, the 105 DC gives a true stellar optical performance and is one of the finest Nikkors ever made.（尼康有史以来最好的镜头之一）It comes in a professional-looking crinkle finish and the construction is metal rather than plastics - thank you, Nikon. However, all numerals and lettering on its barrel are just printed, not engraved, which is a pity considering the elevated price this lens commands.
Its optical design includes rear element (RF) focusing, which is a special case of internal (IF) focusing, so the length of the lens won't change while it is focused. The near limit is 0.9 m, which allows for tightly composed shots. AF operation is fairly quick but not noise-free. As manual focusing is fast and easy thanks to a generously sized focusing collar, the AF performance isn't an issue at all and focusing the lens manually probably will be the preferred option (at least, for me). In common with other high-speed lenses, the 105/2 DC snaps positively into focus. You can be assured of high-quality imagery even at f/2, and from f/2.8-f/4 picture quality is stunning. Beyond f/5.6 performance begins to decline, so this is clearly a lens built for speed. Across the entire aperture range, image contrast is high and colours are vividly rendered. The RF system, however, may introduce slight colour fringing in highlights outside the focused zone. Many IF lenses exhibit this trait.
There is a sliding-out sunshade, which, fortunately, can be screwed firmly into place. Be aware though that the threads are finely pitched and the hood occasionally gets stuck in the locked position. The lens has a 72 mm filter size, which is at variance with the current 77 mm standard for the Nikon professional lens line, but the smaller size does keep the lens more compact. The front element is deeply recessed and the propensity for lens flare is low. Even under adverse light situations there is virtually no ghosting either, so this is a perfect lens for available-light shooting. The superb optical performance at wide aperture settings helps in this respect, too. Geometric distortion is virtually non-existent, a desirable trait if you are into architectural photography or suchlike applications.
The DC feature actually is a user-controllable over- or undercorrection of residual spherical aberration in the out-of-focus zones. A rotating collar adjacent to the focusing ring allows setting DC to operate in front of, or to the rear of, the plane on which the lens is focused. In conjunction with a nicely rounded aperture opening, this allows the bokeh of the image to be precisely managed. If the DC setting coincides with the selected aperture, nicely glowing highlights and pleasingly smooth images are obtained, but still a biting sharpness is present in the image. You can go one further by maxing out the DC setting to get very visible softening of the non-focused areas. This depends on using quite wide apertures because the deliberately introduced spherical aberration is largely eliminated when the lens is stopped well down. The best effects are obtained in the f/2 to f/5.6 range. It is difficult to envision the optical effects from defocusing the image unless you practice this for a while. Each alteration of the DC setting demands refocusing the lens so operating the 105/2 in DC mode can be cumbersome for the novice user.
I just recently acquired this lens, but it has quickly become one of my favourite lenses on D1X.（我是最近才得到这只镜头，但却很快成为我最喜欢的镜头之一）For my own shooting with the 105/2, I tend to work with the defocus control switched off. However, DC is a nifty feature when the need for it arises, such as in portraiture, and being incorporated in the lens design, DC is literally at your fingertips, with no extras needed.

105 135 DC 都是很牛的

是的 无论数码还是胶片！

紫边控制好点的话 我就不等新的135 1.8VR了。。。

急需更新

如果以后出来新的135 1.8VR，紫边控制好点的话， 我就不等更更新的135 1.0 VR X了。。。

dc功能很难用好，总之我发挥不好这只镜头

105 2的成像比135 2好不少，尤其是紫边控制上！

是的，很锐

看不了这样的长文，不如直截了当，在加上图片受用。