本人最近进了一台M6TTL，想在ebay上淘个二手的50/2镜头。可是到网上一看，简直让俺发晕，同样写着Summicron 50的头有那么多的版本，真不知道该买哪个好。俺在坛子里多处求证，未得其果。今偶见一篇文章详细介绍了50/2历代版本的变迁和特点，俺试着翻译出来供大家参考。

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50/2  Summicron  Many variations, so it can get confusing.  Many consider the 50 Summicron best of all 50 mm lenses, by any manufacturer.  It's the standard that other 50's are judged by. （50/2 Summicron有许多版本，所以常使人感到混淆。许多人认为50 Summicron是所有厂家的所有50mm镜头中最好的。它是评判其他50mm镜头的标准。）
· First version 1954-1957 Collapsible chrome. A good lens, but not as good as the later lenses.  EXTREMELY likely to be found with lens scratches.  It has a VERY soft front coating.    Likely to be encountered fogged from original owner, see Fogging.  Not collapsible on M5 or CL due to meter constrictions. 7 elements, focused to 40"（第一版，1954-1957年生产，银色缩头。好头，但还是没有后来的好。他前面的镀膜非常的软。很容易在第一用家手上就被不小心弄花了。因为测光器的原因在M5和CL上不能缩回。7片，最近对焦距离4英尺。）
· Second version 1956-68 Rigid chrome, although a few were made in black by special order. Aesthetically a very handsome lens, sought after by shooters and collectors. This lens was   tested to have the highest resolution (at the expense of some contrast) of any 50 Summicron several years ago by a Japanese photography magazine.  Again, very prone to front lens scratches.  For many years thought to be the same optical formula as the collapsible, recently it has been confirmed to be slightly different.   Likely to be encountered fogged from original owner, see Fogging.   7 elements, focused to 40" （第二版，1956-1968年，银色刚性rigid头，有极少数特别定制的黑色头。从美学角度来说是一颗非常英俊的头，它是摄影家和收藏家追寻的对象。几年前一家日本摄影杂志的测试表明此头在所有的50 Summicron镜头中具有最高的分辨率。仍然是前片容易花。许多年来人们都认为它的光学设计同前一版缩头是完全一样的，近来才被确认与前一版有轻微的不同。很容易在第一用家手上就被不小心弄花。7片，最近对焦距离4英尺。）
· Third version 1956-1968  Dual Range Summicron,  chrome.   This is a special close focusing version of # 2 above.   The 50/2 Duel Range Summicron had the highest tested resolution of any lens ever tested by the great and sadly departed American photography magazine, Modern Photography.   It has the closest RF coupled focusing of any M lens.   7 elements.   Most "experts" say the optical formula is the same as the rigid, but many   experienced DR users claim they get different results and so believe they must be different formulas.    With a flat platform for the "eyes" on the top of it's focusing barrel, the DR is not as  pleasing aesthetically as the rigid.   Nevertheless,  the DR is very sought after by shooters.   Again, very prone to front lens scratches and also fogging if bought from the original owner, see Fogging.    for Pics （第三版1956-1968双区间DR Summicron，银色。此头是第二版的近距对焦特别版。已经停刊的美国摄影杂志——现代摄影杂志测试表明50/2 DR Summicron镜头在所有测试过的镜头中具有最高的分辨率。它在所有M镜头中组合取景对焦距离最近。7片。大多数“专家”都说他与第二版rigid头的光学设计一样，但许多有经验的DR用家都声称它们具有不同的效果从而坚信其光学设计的不同。DR镜头的对焦筒上方有一个安装“眼镜”的平台显得不如上一版美观。无论如何，DR也是摄影家们追逐的对象。同样是前片容易擦伤，如果是从第一用家手上买来同样会花。）
The 50/2 DR will probably work fine on the M6, but you must remember to mount and dismount the lens focused at infinity.   When focused near it's closest regular focusing distance, the lens will be difficult to mount OR unmount.    I have reports of  the DR not functioning in close up range on a M6.   I am frankly unsure if these reports are due to variations with the bodies and the DR, or are the result of user error.  More research will till.   It seems prudent to try a  DR  on your  M6  before you buy it.  （50/2 DR 可能会在M6上工作得很好，但是你切记装卸镜头时要将镜头调焦到无限远。当调焦到接近它的常规对焦距离的最近端时它将难以装卸。我有关于DR镜头在M6上近距不能工作的报告，但我不能确定这些报告是因为机身、镜头不同还是错误使用的原因。我将做更多的研究。谨慎的做法是买DR之前在你的M6上试一试。）
Howard Cummer in Hong Kong reports difficulty using a 2nd series DR in close-up range on a M6 .85  # 2296539.   While he could mount the lens, if it was not focused at it's closest regular focusing distance, the close up range was inoperative due to some sort of internal body restrictions.   Whether this is true of all late M6's in general, or of just the .85 model is not clear at this time.   In any case, it's a good idea  to try it out  to be sure on your own body/lens combination.  （香港的Howard Cummer先生报告说在他的号码为#2296539的M6 0.85上使用第二代DR镜在用近距对焦时有问题。他能装上镜头，如果不能在常规对焦区间的最近端对焦，那么近距对焦就不能工作，原因是机身内部的某种限制。目前还不清楚这种情况是M6的普遍情况还是仅对0.85。无论如何，用你自己的机身/镜头组合试一试是个好主意。）
The 50/2 DR will NOT work on a Minolta CLE in my experience.  Although the lens will mount, it will bind with the body just slightly from the infinity marking. （根据我的经验50/2 DR不能用在美能达CLE上。虽然能装上，但装在一起后无限远的标记总差一点点。）
The DR lens has two focusing ranges, thus the brilliant name "Dual Range." The DR can ONLY be mounted on the camera without it's "eyes."      The "eyes" are a detachable viewfinder which clips onto the top of the lens and in front of the camera's rangefinder/viewfinder.   They look pretty much like the viewer built into the 135/2.8 or the M3 versions of the 35/2 and 2.8.   Once mounted, the closer focusing range is attained by turning the lens to it's closest normal focusing point.     Then attach the "eyes" which clip onto the lens.    ONLY at this focus point can the eyes be attached and the closest focusing range attained.   THEN pull the focusing barrel out slightly, and the lens barrel can be swung over farther to the left, to get into the close focusing range.    It sounds more complicated than it really is in practice.（DR镜头有两个对焦区间，所以才有了这个“双区间”的名称。DR镜头只有拆掉“眼镜”才能装上。“眼镜”是个卡在镜头上方而且在相机的对焦取景器前面的可装拆的取景器。它看起来与135/2.8以及用于M3的35/2和2.8的观景器非常相像。一旦装上它后，只要将镜头转到普通的最近对焦距离处，就可获得更近的对焦。所以，只有在这个对焦位置才能把“眼镜”装上并且卡到位，同时可获得最近的对焦。然后轻轻将镜头的调焦筒拉出，镜筒就可以继续向左转动以获得更近的对焦距离。这听起来很复杂，实际操作并不复杂。）
It is worth noting that many experienced used find the DR Summicron not only their favorite 50, but their favorite lens, period.    It has a combination of higher resolution and lower contrast and superb out of focus images.  （许多资深用家发现DR Summicron 不仅是他们最喜欢的50mm镜头，更是他们最喜爱的镜头。它同时具有高分辨率、低反差和优美的焦外成像。）
The Earlier version of the DR focuses to 19" and is marked in either feet or meters, but not both.  It is also marked in reproduction rations from 1:15 to 1:.75.   The  "eyes" for these have the "condenser"  trademark, inside of which is "E.
Leitz Wetzlar."（较早版本的DR可对焦到19英寸，距离标记为英尺或米，但不会二者都标。镜筒上还标出1:15到1:0.75的成像比例。“眼镜”上有带有“E. Leitz Wetzlar”字样的商标。）
The Later version of the DR focuses to 20" and is marked in BOTH feet and meters, without the repro ratios.  The "eyes" for this version are  marked "Leitz Wetzlar" without the condenser trademark.     The second version also has wider and deeper knurling on the focusing ring than the previous version.  I have noticed a "warmer" color of lens coating on these later DR's, but am not sure if it extends to ALL of this variety.    The lens head and glass appears to be identical to the earlier version and to the rigid version, at least from the outside.   The second version also has a smaller ball bearing mount for the eyes, which means the later eyes will not fit the earlier lenses, though the older eyes will fit the later lenses. （后期版本的DR对焦距离为20英寸，同时标有英尺和米，但是没有成像比例。此版本的“眼镜”上标有“Leitz Wetzlar”但没有商标。第二版调焦环上的棱比前一版更宽更深。我注意到晚期的DR镜的镀膜颜色较“暖”，但我不能确认它们是否都是这样。从外表上看，此版本的DR与前一版甚至与rigid版的头部和玻璃都一模一样。第二版安装眼镜的处的小球较小，这意味着新版的眼镜不能用在旧版的镜上，虽然旧眼睛可以装到新镜头上。）
· Fourth version 1969-1979 Black lens with no "50" on barrel,  No  focusing lock or lever.  Generally reputed to be a notch below either of the Summicron versions before or after it. 6 elements.  This and later versions focused to 28, the closest focusing RF coupled 50 after the DR." （第四版1969-1979，黑色镜筒上没有“50”字样，没有对焦锁和把手。通常被认为是Summicron前后版本的分界线。6片镜片。此镜及以后的版本可对焦到28英寸，这是继DR之后50mm取景器对焦的最近距离。）
· Fifth version 1980-95  Black lens with "50" on barrel, reintroduced focusing lever, without built in hood.  In my opinion this is a better choice in terms of handling than the built in hood version which followed it.    I am a fan of both the focusing lever and the larger attachable hood.  Nice lightweight lens at only 195 grams  6 elements, recomputed.    Earlier lenses are Made in Canada, later Made in Germany. （第五版1980-1995黑色镜，镜筒上刻有“50”字样，重新加上了对焦杆，没有内置遮光罩。本人认为这比后来的有内置遮光罩的版本更好把握。我热衷于对焦杆和大的附加遮光罩。轻量级的镜头只有195克，重新设计的6片镜片。早期镜头产于加拿大，后来的产于德国。）
· Sixth version 1995-date  Black or chrome  lens with "50" on barrel and built in hood.  No focusing lever.  Same optical design as previous version. Weighs more at 240 grams in black.  The chrome version weighs much more at 333 grams, so I would avoid it.   Same optical formula as previous version. （第六版1995-现在，黑色或银色，镜筒上刻有“50”，内置遮光罩。不待对焦杆。光学设计与前面的版本相同。黑色的重240克，银色的重达333克，所以我不会用它。光学结构与前面的一样。）
· In December 2001,  Leica announced  500 50/2 Titanium lenses would be made to match their newly introduced limited edition .72 M6 TTL Titanium body.  （2001年12月，Leica宣布出产500支50/2钛镜以配合它新推出的M6 TTL 0.72限量钛机身。）
50/2 Elcan made for the military version of the M4, the KE-7A.  Rare and Expensive.  ELCAN stands for E. Leitz Canada, the former Leica  facility.  Leitz sold it to Hughes, who was bought by General Motors, who just sold it to Raytheon (1/98).  The plant  continued to make selected Leica lenses, at least up to the recent Raytheon purchase.  ELCAN specialized in various military lenses, which show up from time to time, often without the special cameras they were designed to work on.（50/2 Elcan 是为军用版的M4——KE7A制造的。稀有且昂贵。Elcan代表Leica 以前的工厂——加拿大的E.Leitz。Leica将它卖给了已被通用汽车公司收购了的休斯公司，而休斯公司刚刚（98年1月）又把它卖给了Raytheon公司。此工厂一直在生产某些Leica镜头，至少是到Raytheon收购它为止。Elcan被多次披露是专门从事于各种军用镜头的，但常常是见不到特别的相机。）

原文出自http://www_cameraquest_com/classics.htm

[2004-01-14 00:27 补充如下]

怎么贴上去以后这么难看。那位老编帮俺排排版，规整规整。

俺那张是没有调饱和度的（ED IV底扫)，魔术手出的一张饱和度比这张还高呢

看看第六版50/2的颜色。先声明，只看颜色，别说细节，呵呵。没扫描仪，这是用小数码对着打在墙上的幻灯拍的，没ps，颜色和墙上的一致，只是细节损失严重，有点惨。底片是EB3。

俺刚进的标头，编号2508656。经查证1973年产，属第四代产品。
该头镜片非常完美，阻尼很好，片子也非常棒，完全感觉不出是30年前的产品  。但价格也不菲，超过5000大洋。
所有的资料对此头介绍甚少，有那位DX知道的多，谈谈！谢了！

偶和楼下samfan问题一样

SamFan
泡菜
帖数:971-77
图数:0/0-0
字数:38K-0K
注册:2002年11月  借问一下50/2 Summicron L39卡口的几个版本？

对了，还有一件事得提醒一下。将Summicron50DR用在M6TTL上时，如果要用眼镜，得把眼镜后面的一个黑色塑料定位柱拆下来（直接用一颗螺丝拧上去的），否则由于TTL的额头比较高，眼镜装不到底。

Elysia
  有钱就买镜头

好贴！顶一下
个人比较喜欢第二代的，我认为是leica标头中造新最完美的一个。
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i agree

Summicron 50 DR最大光圈时的焦外成像不够柔和，有比较明显的二线性。也许这就是它“锐”的副作用吧。

請問各位!DR有兩代,而它的眼鏡有的是上面有六角商標,有些則沒有六角只有Leitz WETZLAR,兩者有否分別?是否能從它的分別而辨別是那一代?DR的S/N是從幾多号到幾多号呢?DR總生產有多少呢?

謝謝各位!

看来搂主的镜头的确划算, 我当时买这支头时划了1500新币, 差不多是你这个价格的一倍呀.成色道还可以,有原来的纸盒,不过没有你那个皮桶.

有钱就买镜头
泡菜  

好贴！顶一下
个人比较喜欢第二代的，我认为是leica标头中造新最完美的一个。至今一直在找成色好的给我的M3，以前看到几个不是前片玻璃花的利害就是手感有点涩!继续努力中！！比较现在的限量50mm，我觉得老的比较实惠。新的性价比太低，即使它只有1000枚！
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几乎全新第二版的Summicron 50/2 RIGID

[Elysia 编辑于 2004-03-01 08:04]

上一张带眼镜得DR 拍的图片2

借问一下50/2 Summicron L39卡口的几个版本？

有个99%新的第二版50/2 Summicron rigid (1966年最后批老鏡)和五十周年复刻版纪念镜，正好相得益彰。

俺的是1784716，是第二版的DR头。