AIS28-50/3.5

AIS28-50/3.5在全幅上视觉极舒服

AIS28-50/3.5

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AIS28-50/3.5

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Comparison: MF 28-45 4.5, 25-50 4.0, 28-50 3.5

I have to admit that this is a very unusual comparison but I wanted to compare the rather rare 28-45 f/4.5, the 25-50 f/4.0 and the 28-50 f/3.5- Please note that this is by no means a scientific comparison. These are only my thoughts about these three MF lenses. I found out that there is very little information about these lenses on the internet and therefore my view on these lenses might be of interest for some. I would love to hear opinions on these lenses from others!

The History

These three lenses are successors in chronological order. The 28-45mm 4.5 appeared in 1975 and was the first wideangle zoom by Nikon and in fact the first wide angle zoom ever that started at a focal length of 28mm. This may not sound exciting today because we are spoiled by the 12-XX or 17-xx zoom offerings that are very common nowadays. In it's time the 28-45 was a real sensation and a technological breakthrough. It was aimed at the professional market and was produced between 1975 and 1978 with a total production of about 26.000 lenses. Dimensions: length: 91mm diameter: 75mm with 72mm filter ring, Weight: 440g. Two-ring design.

The 25-50mm 4.0 appeared in 1979 and replaced the 28-45mm. It is very bulky, offers more zoom range and speed. Produced between 1979 and 1983 with approximately 27.000 units. Dimensions: length: 112mm diameter: 75mm with 72mm filter ring, Weight: 600g. Two-ring design. The front rotates while focusing.

The 28-50mm 3.5 does not seem to fit in this set. Contrary to the other two lenses it is a push-pull zoom design, it is very small compared to the other two lenses and considerably lighter. From the zoom range it offers and because it was introduced in 1984 it can be concluded that it is the successor to the 25-50. But neither construction, built quality and weight make it a natural successor the the older pro-calibre lens. It was half the price of the 25-50 and it was quickly replaced by the now obviously consumer oriented 28-85mm 3.5-4.5 just one year later. Production ended already after approximately 20.000 lenses. Dimensions: length: 75mm diameter: 68.5mm with 52mm filter ring, Weight: 395g. Push-pull zoom with DOF marks and a macro setting at 50mm. Testing was done on a D200.

Optical performance:

28-45 f/4.5:

This lens is sharp even wide open but it is very difficult to focus this lens in darker environments, the green focus indicator sometimes does not indicate correct focus in these situations. Overall image quality is great and comparable to the other two lenses. Not much difference in performance on the long or wide end. Flare is a real problem with this lens. Even with a HN-20 hood which was designed for the 85mm f/1.4 Nikkor this lens flares badly and suffers from a high loss of contrast even in backlit situations. CA is a non-issue.

25-50:

Sharpness is only average at f/4 with a little internal flare, but it sharpens up well in post processing. When stopped down to f/5.6 things improve dramatically, sharpness is even across the frame and into the corners. On the wide end optimal results are achieved from f/8 on, at the 50mm end peak performance is already achieved by f/5.6. CA is extremely low to even non-existing and distortion is very low compared to modern zooms. The lens suffers from some flare and ghosting, be sure to use an appropriate lens hood. It flares less than the other two lenses. Pictures taken with this lens really "pop" and picture quality won't get any better in this range when stopped down to at least f/5.6. Perfect landscape lens with great colour and great contrast even wide open.

28-50 f/3.5:

Center sharpness is only average at 3,5 but good at f/4.0, excellent at f/5.6. It is a tiny bit sharper at f/4 and f/5.6 compared to the 25-50 4.0 (really not by much), at f/8 the 25-50 f/4.0 is better and remains to be the better lens up to f/16. Colour is excellent, contrast wide open is a bit lacking but improves even with moderate stopping down. The corners on the 28-50 get excellent at f/5,6. It features only moderate CA with a little bit more flaring than the 25-50. The macro setting at 50mm is good for a reproduction ratio of 1:5.

Conclusion:

The 28-45mm lens is the weakest of the trio. From today's perspective (especially on DX-cameras) it does not offer enough zoom range to be overly useful. The lack of viewfinder brightness is a major issue with today’s DSLRs that are not optimized for manual focus any more. This lens may be of interest for collectors because it was the first zoom ever that started at a focal length of 28mm and therefore marks a technological milestone. If you can live with the limited zoom range and the flare issue this lens is a good buy if you can find one, image quality is still better from f/5,6 on compared to modern kit zooms.

The 28-50mm takes the second place in this comparison. Corner performance wide open is not up to the professional level that the other two lenses provide. If you are looking for a compact zoom lens in this range with very good performance this lens will do the trick. Image quality wise this lens comes very close to the 25-50 and the macro setting might be useful.

The 25-50mm certainly is the best pick with an optical quality that is simply stunning. The complete lack of CA is amazing and the "wow" factor that pictures produced with this lens cause is well regarded. If you don't mind the size and weight of the lens it will serve you well. Sometimes size matters, it seems

刚刚进了一个28-50，大家认为这个镜头是不是可以比美定焦镜头呀？

是的，确实不错

我攒了3对：

25-50  50-300
28-50  50-135
38-76E  75-150E

这头不错，和AIS 50-135是一对

另外一个25-50/F4和50-300/4.5是一对

支持一下

3只综合比较下来，28-50是个好头

从左到右：
AI 28-45/4.5  AI 25-50/4  AIS 28-50/3.5 三代同堂

对比测试五
af 35 2d f4

对比测试三
nikon ais 28-50 3.5  光圈全开就很清晰锐利  比定焦不差

对比测试一
auto 50  2 光圈全开

外观图

希望尼康更新下，出个自动版