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Voigtländer Ultron 40mm F2 SL II



  Voigtländer Ultron 40mm F2 SL II

  Aperture ratio: 1:2
  Smallest aperture: 22
  Lens construction: 6 elements in 5 groups
  Angle of view: 57°
  Aperture blades: 9
  Nearest distance: 38cm, close up lens for 25cm (1:4 magnification) included
  Diameter: 63mm
  Filter size: 52mm
  Dimensions: 63 x 25mm
  Weight: 200g
  Macro ratio: 1:7

  日本确善能Cosina)公司生产的福伦达Voigtländer)Ultron 40mm F2 SL II,镜片6枚5组对称式双高斯Planar结构,含一枚压模非球面镜片,9叶光圈,II代内置CPU,可在Nikon D200以下各档机型中实现测光,这似乎是尼康用户代替那只几近绝迹的黑色Nikkor AI 45mm f/2.8 P饼干头的唯一选择了。
  在I代与II代之间犹豫了许久。I代全金属镜身镜盖,重量比II代多出50余克,有评价称Bokeh优于II代,但我在样片中没有发现太大差异。II代内置CPU,可以解决尼康中低档相机无法使用手动镜头测光的问题,与Nikkor P型镜头类似,另外包装内配套圆孔遮光罩及近摄镜各一枚。唯一遗憾的是那个极易沾染灰尘的橡胶对焦环。I代镜头也已经停产,但市面上还有不少新品,售价在2200元左右。II代镜头因为量产不久,国内更为罕见,售价除去400元左右的遮光罩与近摄镜,价格基本与I代相当。最近,我只在广州这家店里看到新品,不二价,包含邮资总计2980元。
  Nikkor AI 45mm f/2.8 P镜头拥有漂亮的Bokeh,从样片中感觉仍然优于这只圆形光斑呈现同心圆叠套状的福伦达镜头。9叶光圈带来的柔和焦外是我买这只镜头的原因之一,之所以考虑到我几乎从来不太看重的焦外,是我希望使用这只镜头兼顾人像。实在不太喜欢中长焦镜头,我都没有。
  自从福伦达被确善能公司收购后,确善能生产的福伦达品牌镜头屡遭非议。除了有对德国镜头在日本生产后品质改变的担心,还因为确善能除去复刻部分福伦达经典镜头外,还以福伦达商标生产了与福伦达没有一丝血缘关系的镜头。比如与这只40mm镜头同时推出的SL系统中的Nokton 58mm F1.4 SL,这只实际复刻自1963年日本东京光学(Tokyo Kogaku)RE. Auto-Topcor 58mm 1:1.4的镜头,有着更好的Bokeh,可惜我没有全画幅的Nikon D3,用在APS画幅上82mm焦距的等价就太长了。

  福伦达镜头型号中的Ultron意味大光圈快速镜头,Aspherica意味采用了非球面镜片以最大程度消除色差。

  借用卖家的图片,浏览这只Voigtländer Ultron 40mm F2 SL II镜头的细节。



  与I代白色的包装盒不同,II代黑色的包装盒更漂亮美观。同样与I代全金属的螺旋镜头盖不同,II代因为附送了那个华而不实且价格高昂的遮光罩,塑料捏扣式镜头盖直接扣在小孔径的遮光罩上,这样更为便捷实用。



  配套的近摄镜同样需要旋于遮光罩而非镜头之上。使用近摄镜后,最近对焦距离由38厘米缩短为25厘米,放大倍率由1:7增加为1:4,可惜算来价格不菲,否则倒是可以兼做UV镜之用。



  圆孔遮光罩。I代遮光罩做为选配件,有方孔及圆孔两种,对出片影响不大,仅供亮骚之用,尤以方孔遮光罩为甚,六百多元的价格尚难以寻找。II代圆孔遮光罩因为要用作遮光罩及镜头盖的基座,多少还有些实用价值。



  弹性橡胶对焦环绷于镜身之上,冬天对焦是不再像金属对焦环那样冰凉冻手了,可惜太容易沾灰,而且福伦达SL系列镜头中出现非金属件,多少显示有些不够档次。





  搭配Nikon D200的标准像,很漂亮。



  尼康AI-S卡口,内置CPU,5点电子触点。

  附:PhotoZone.de评测:

  Introduction
  In a world of plastic zoom lenses it is fun to check out high quality fix-focal length lenses every once in a while and the Voigtlander Ultron 40mm 1:2 SL II is one representative of the species. It almost seemed as if Cosina, the manufacturer of Voigtlander lenses, abandoned the SLR lens market in favor of the Zeiss Z-series which are manufactured in the same factory. However, Mr. Kobayashi, the president of Cosina, obviously felt that old itch again to rival the big boyz by releasing a couple of lenses of his own. The Ultron 40mm 1:2 and Nokton 58mm 1:1.4 (to be reviewed soon) are the first and hopefully not the last of these new SL II lenses. Both lenses aren't really new - they were already part of the SL I series - but they've been revised a little. The most obvious difference is the new finish - it's all black now and the chrome focus ring has been replaced by a rubber variant (which is a good thing in my opinion). Under the skin the lenses feature a CPU now so they can take advantage of the camera's matrix metering system. The Ultron 40mm 1:2 is marketed as a so-called pancake lens because it is merely 25mm "long" - this is very short but the discontinued Nikkor Ai-P 45mm f/2.8 is still shorter (although also slower obviously). Used on an APS-C DSLR its field-of-view is equivalent to a classical 60mm lens which is a bit in No Mans Land in my humble opinion. However, it is a full format lens and as such not limited to the APS-C scope.
  The build quality of the lens is absolutely beautiful. The outer barrel is made of metal and it's a pure joy to use the well-damped focus ring. Unlike on other pancake lenses manual focusing is also doable without major obstacles - it's a tiny lens but not to the max. The lens extends a bit when focusing towards closer distances and the front element does not rotate. The tiny but efficient dome-type lens hood can remain mounted without any significant increase in length. Typical for Voigtlander SL lenses the Ultron is a manual focus lens. This may be a strange thought for some but the in-focus indicator in the camera viewfinder remains active so you always have some sort of guidance other than the visual feedback although a split-image screen helps to increase your keeper rate naturally. The lens has a dedicated aperture ring but on modern Nikon DSLRs you have to set the lens to automatic aperture.

  Distortions
  The Ultron produces some mild barrel distortions (0.6%) which is usually nothing to worry about in field conditions.



  The chart above has a real-world size of about 120x80cm.

  Vignetting
  The 40mm 1:2 is a full format lens thus enjoying a sweet spot advantage on APS-C DSLRs. However, there's still a bit of vignetting visible at 1:2 (0.63EV) but it doesn't reach really disturbing levels. The problem is negligible from f/2.8 onwards.

  

  MTF (resolution)
  The resolution figures produced by the Voigtlander are pretty impressive throughout the tested aperture range. At 1:2 the resolution is already very high both in the center as well as the borders. At 1:4 the center quality receives a boost into extreme resolution territories - it surely exceeds the sensor resolution here as well as at 1:5.6. The border quality increases steadily from 1:2 towards medium aperture settings although it generally remains within very good(+) quality scope here.
  Below is a simplified summary of the formal findings. The chart shows in line widths per picture height (LW/PH) which can be taken as a quantity for sharpness. The chart is limited to the visually relevant LW/PH range of [750, 2250]. If you want to know more about the MTF50 figures you may check out the corresponding Imatest Explanations.

  

  Chromatic Aberrations (CAs)
  Chromatic aberrations (color shadows at harsh contrast transitions) are slightly higher than average for a fix-focal length lens in this class. The CAs aren't extreme but at around ~0.8px on the average at the image borders they aren't totally negligible either.

  

  Bokeh
  Voigtlander lenses have quite a reputation when it comes to the quality of the bokeh - the rendering of the out-of-focus zones. Unfortunately the Ultron is a bit of a exception to the rule here. Out-of-focus highlights are pretty circular but at 1:2 they have a bright, outlined perimeter. Fine structured, high contrast objects can appear rather "nervous" here - see e.g. the first card in the foreground of the bokeh stress test scene below. You may also check out some of the scenes shot at 1:2 in the sample image section. The silver balls in the foreground show a bit of purple fringing but this is a comparatively mild effect for an 1:2 lens. Stopping down improves the bokeh quite a bit (marginal outlining, smoother transitions) but regarding the focal length most users have probably a priority on the max. aperture setting.



  Verdict
  The Voigtlander Ultron 40mm 1:2 SL II is a welcome addition to the fix-focal length segment of the market which isn't overly well supplied by the big manufacturers. The Ultron is a very sharp lens straight from the max. aperture but especially around 1:5.6. The amount of distortions and vignetting is generally negligible in field conditions. Lateral Chromatic aberrations are a bit higher than average but they don't reach worrisome levels. The biggest problem of the lens is the only average quality of the bokeh - the out-of-focus rendition. This is a bit unfortunate because this is one of the primary playgrounds for such a large aperture lens. The build quality of the lens is exceptionally high and it is a joy to use it in field conditions despite or maybe because of the lack of AF. Regarding its size and weight is a nice companion for travels - less so for portrait photography.
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