俺对光学术语一直就是一知半解俺的意思是控制变形。

广角头这东西，就是用28以后就会惦记24，24以后又会惦记20

其实广角畸变并不是坏事，使用一段时间就熟悉了，控制得好的话，在需要避免畸变的时候控制畸变的产生，需要视觉夸张效果的时候合理地利用畸变。

多谢多谢，基本就这个28了，考虑到米的问题就得是他了！

说实在话，俺没用过24/2，但是用24/2.8和28/2.8。但如果要说“成像锐利”，则应首推28/2.8。另外28/2.8的色彩表现真的是非常好，畸变几乎没有。

先看看Kenrockwell对这两只镜头的评价。
关于AI-S 24/2
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Performance:

It probably has the usual Nikon wide-angle performance: great performance all over when stopped down and great in the center at all apertures.

It probably also has the usual light falloff and fuzziness due to coma in the corners at full aperture that improves a stop or two down.

Once stopped down a couple of stops it's probably great.

It has the usual barrel distortion.

Recommendations:

If you want the fastest, sharpest wide angle lens get the 28mm f/1.4D AF.

Otherwise, this lens has had its niche for decades. Try it yourself and see how you like it.
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他老人家说“它在尼康广角镜头中表现平常，全开光圈时边角失光且分辨率下降。有通常的桶形畸变。如果你想要更快更锐的镜头，用AF28/1.4”。

再看看对AI-S 28/2.8的评价
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Performance:

It has no ghosts or flare, so feel free to put your light sources in your image.

It seems to be a bit slower than f/2.8, probably closer to about f/3.0. That's not a big deal; cheating a bit like that allows Nikon to squeeze in a little more sharpness.

Sharpness is extraordinary. There is some very slight coma in the corner at f/2.8 that is gone by f/4, far better performance than any other wide angle Nikkor wide open save the 28mm f/1.4D AF. The 28mm f/2.8 AI-s seems almost diffraction limited by f/5.6. That's lens designer speak for "really, really good!"

Here's the breakdown by aperture:

At f/2.8: sharp all over with the exception of very slight coma in the corners, some light falloff
At f/4: Fantastic, seems diffraction limited!
At f/5.6: Ditto. I've never seen a sharper lens on my Nikon.

Recommendations:

This is the sharpest wide angle made for Nikon daylight photography. Not only that, but it seems you can get them used for $150 US and they work (manually focussed) on every Nikon camera, including AF. On some cheaper AF cameras you loose metering, but heck, mounted on your F4 or FA you even get matrix metering. New they go for $360 US.

This AI-s lens (1981-present) is completely different from the older AI lens (made 1974-1981) which I have not tried. Nikon made a big upgrade to this lens' optics when they upgraded it to AI-s, and they really pulled out all the stops. No other Nikon 28mm lens performs this well: the 28mm f/1.4D AF has some barrel distortion and really is optimized for night photography, and every other 28mm lens just isn't designed as thoroughly. The Series E lens was only a common 5 element design, and the AF and AF-D versions are the same as the Series E design. In 1998 Nikon introduced a 6 element 28mm f/2.8 AF which I have not tried, but have read elsewhere is quite good.

If you want great sharpness and perfectly straight straight lines, go get one of these lenses new or second hand. You'll love it, presuming you get a good sample.
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Kenrockwell说这支镜头是尼康设计的日间用广角镜头（AF28/1.4是专为夜间摄影设计的）中最锐利的，它完全没有畸变（相比之下AF28/1.4都多少有些畸变），即使是对着光源拍摄也完全没有眩光。再看看它的价格，绝对是买了不后悔的。

俺个人的观点，如果为人像考虑，最好不要在这两个镜头身上打主意。应该来说24/2和28/2.8都是为风景或人文摄影设计的镜头。但如果就针对这两个镜头来选择，俺觉得应该买28/2.8，二手的只要一千出头，真正的价廉物超美的选择。

其实尼康52mm家族大多数都是很价廉物美的，除了那个“丧心病狂”的58/1.2 noct以及价钱稍贵的24/2、28/2和35/1.4。玩尼康的人谁手上没有几个52mm的头？

UD太招眼了，还是这只小巧 前两天跟人亮骚，问别人这是多少的头？大多都回答：标头。。。嘿嘿。。不知道俺的这个“标头”可有94.5度的视角呢

20mm F3.5UD也很好，不是52mm，是72mm，但金属感很强。

恭喜LazyWriter!
俺有一只AF20/2.8，但通常都把它装在D100上当个小广角用。

85mm 的auto 镜是52mm的，但ai己经要72mm，大了三个尺码，
真想知道囗径大小与镜头的关系，可於52mm囗径光学己能
做到，又何需加大成本提升至72mm呢？而且在ai镜，镜片的大小
也很紧凑，几乎也用尽了。请教楼主。
在外观，眼睛大一些的确是非常吸引。

有用过同是52mm口手动105/4微距老头的DX给说说此头!!

问:现在ais24/2的新头还有么?nikon是不是还有生产`````我想买个新的,有劳各位知道的DX了!!!急!!!

汗颜。52mm的头俺实际上只有过AI24/2.8, AI28/2.8, AF35/2D, AIS50/1.4, AF50/1.8D, AF50/1.4D, AIS58/1.2, AIS105/2.5, AI135/2.8和AI200/4，其中28、35、50/1.8和135早已属于别人了。

现在最常用是50mm和35mm头也是52mm的。也是很普遍的。

楼主说虚化差，这头对我来说也足够了。

[catsun33 编辑于 2004-08-18 18:24]

尼康的20MM/4在FE2上不能实现光圈优先.因为是非AI头.在FE就能实现A档.不信你去试试

刚刚翻看了《无忌》里的一些帖子，俺才真正整明白（以前也和白鲢道长讨论过） Nikon noct 58mm/1.2 S 才是标头里最最值得拥有的！可它 150,000 日元的价格可是要吓死人的。

上张 PP，这可是俺从宁编（宁采臣编辑）的帖子里抠出来的！