Wilhelm Chang Photography

資料來源:Lensrentals
上週Nikon的新小小黑70-200 f/4 VR開始出貨，LensRental在收到鏡頭後，
對小小黑和Tamron 70-200 f/2.8 VC做了初步的解像力測試，
也把小小黑對小黑六做了初步比較，以下是全文翻譯:

We got stock on two new 70-200mm lenses this week: the Nikon 70-200 f/4 VR and the Tamron 70-200 f/2.8
VC. I would have loved to do some side-by-side comparisons. They’re priced similarly and I expect a lot of
Nikon shooters will be choosing between these two since both are quite a bit less expensive than the Nikon
70-200 f/2.8 VR II.
本周我們手上有兩支新的70-200mm:Nikon 70-200 f/4 VR 及Tamron 70-200 f/2.8VC
我很想把他們做對照測試，他們售價差不多，由於它們都比小黑六便宜不少，
我想很多N家用戶會在者兩者間選一支來用。

It may be a little different on the Canon side, where the Tamron is priced about mid-way between the Canon
70-200 f/4 IS and 70-200 f/2.8 IS II. But there will still be people considering paying a bit more and getting a
wider aperture, or paying a bit less for the non-Canon 2.8 version.
C家的情況可能稍微不同，Tamron的定價約為Canon 70-200 f/4 IS 和 70-200 f/2.8 IS II兩者的中間。
但總是會有人想多花一點錢換來大一點的光圈，或省一些錢買非Canon2.8的版本。

As always, this isn’t a review, it’s my quick first impression after putting the lens through our normal intake tests. I’m not a lens reviewer. Also, as always, my summary comes first, for those of you who have trouble
reading more than 150 words without a picture.
如同以往，這不是一篇評測，而是我快速對鏡頭做測試後的初步印象，
我不是專門評測鏡頭的，同時，如同以往，對那些不能讀超過150字純文字的人，我先做結論。

The Nikon is a very sharp lens, a bit better at the wide end than the long end, but at f/4 it’s every bit as sharp as the 70-200 f/2.8 VR II is at f/2.8. The VR II, of course, does get a bit sharper at f/4.
小小黑是非常銳利的鏡頭，廣角端比望遠端稍好一些，
但在f/4下，它和小黑六在f2.8下一樣銳利，當然，小黑六在f/4還是比較銳利一點。

The Tamron 70-200 (really it’s175mm) f/2.8 is also exceptionally sharp, and maintains its sharpness
throughout the zoom range, even at the long end. Just be aware the long end is not 200mm. We have the
Canon and Nikon lenses all measured at about 195mm, while the Tamron is about 175mm. For what it is
worth, the Sigma 70-200 f/2.8 is about 185mm.
Tamron 70-200(其實是175mm) f2.8也是相當銳利，而且在整個焦段都一樣銳利，即使在望遠端也是。
只是要注意它的望遠端不是200mm，我們量了Nikon和Canon都差不多是195mm，而Tamron是175mm。
不過Sigma70-200 f/2.8則差不多是185mm

Here’s a comparison, a simple chart 30 feet away shot with the Canon 70-200 f/2.8 IS II at 200mm on top
and the Tamron 70-200 at the bottom. Both were shot from exactly the same place at 200mm.
The Nikon 70-200 VR II and f/4 VR are almost exactly the same focal length as the Canon at this distance.
(The VRII, of course, is shorter when focused on closer objects.)
以下是比較，上面的是Canon 70-200 f/2.8以200端對30呎外的圖表拍的，下圖則是 Tamron 70-200
Nikon 70-200 VR II 和 f/4 VR和Canon在這個距離是相同焦段的(當然小黑六在對焦近物下是比較短的)

Canon 70-200 IS II 200端 圖片來源:Lensrentals

Tamron 70-200 f/2.8 200mm端 圖片來源:Lensrentals


Canon 70-200 IS II 200端 圖片來源:Lensrentals


Tamron 70-200 f/2.8 200mm端 圖片來源:Lensrentals

The focal length difference won’t mean doodly to someone using this lens for portraits or landscapes, but to a sportshooter it might be critical.
焦段的差別不會對人像或風景攝影有太大影響，但對運動攝影則有。

Other than the focal length surprise, the lenses are both solidly constructed, zoom and focus smoothly,
and ooze quality. The Tamron autofocuses very quickly and accurately. It was very close to the Canon
and Nikon speeds, and definitely NOT the leisurely AF we suffered from on older Tamron telezooms.
這些鏡頭都很堅固，變焦和對焦都很滑順。
Tamron的自動對焦非常的快且準，非常接近Canon和Nikon的速度，絕對不是以前Tamron的悠閒對焦。

Imatest Results

We don’t have nearly as many copies as I’d like to test, with 9 of the Nikon and 8 of the Tamron available today. But it’s better than one copy, so off we go.
測試結果
我沒有足夠多的鏡頭來測試，但9支小小黑和8支Tamron也比只測試各一支好。

Nikon 70-200 f/4 VR

The Nikon does very well on our standard D3x test camera. For those who want to know why I’m not shooting it on the D800, that’s because I have tons of comparison data on the D3x, and I want to compare this lens to
those others. You can’t compare Imatest results from two different cameras. Because, well, then you’re
testing the difference in the cameras.
小小黑在我們的D3X上表現得非常好，有人可能會覺得我幹嘛不用D800測試，
那是因為我有很多D3X的比較數據，而且我想要把這支鏡頭和別支比較，
你不能用兩台不同的相機來比較影像測試，因為你會變成比較兩台相機的不同。

圖片來源:Lensrentals

Resolution is a bit higher at 70mm than at 200mm, but the difference is pretty minor. It holds sharpness well into the corners with average corner resolution of over 400 LP/IH, which is very good. I’ve compared it in table form below with the Nikon 70-200 f/2.8 VR II, but remember values are wide open, so the f/2.8
is spotting the f/4 a full stop. At f/4, the f/2.8 VR II is clearly a bit sharper than the f/4 VR.It’s probably worth noting the f/2.8 VR II is as sharp at 200mm as it is at 70mm.
70端時的解像力比200端時稍高一些，不過差別相當小，
它在邊角時也是相當銳利，平均有400 LP/IH的邊角解像，算是相當好。
我有把它和小黑六用下圖的表格比較，但記住數據是光圈全開下的，所以f2.8比f4大整整一級。
在f4時，小黑六明顯的比小小黑銳利一些，不過跟小黑六從70到200mm都一樣銳利比起來不算什麼。

Tamron 70-200 f/2.8 VC

The Tamron is also very sharp, and equally sharp at both ends. At 200mm, it actually appears a bit better, but with only 8 copies I’m not willing to make that call yet. I should also repeat, as I always do, that you can’t
truly compare Imatest results from one camera system to another so it’s not appropriate to compare the
Tamron to the Nikons until we get Nikon mount copies of this lens and test them on the same camera.
Tamron也是非常銳利，而且兩端都一樣銳利。在200mm似乎還更好一些，
但因為只測試了8支，所以我還不想下定論。
但我還是要重申不能用不同的相機系統來測試影像，
所以除非我用Tamron的N接環版本及同一台相機來跟Nikon鏡頭測試，
不然是不恰當的。

圖片來源:Lensrentals

Again, let’s emphasize that I’m comparing the average of 8 copies of the Tamron to the average of over 200 copies of the Canon IS II. The Tamron numbers will change a bit as we add more copies to our database. But even so, the Tamron has done something remarkable. It’s holding its own, at least, with the best 70-200 f/2.8 zoom I know of.
再次強調，我只測試了8支Tamron的平均數據，且和超過200支Canon IS II的平均數據相比。
當我們增加更多Tamron數據到我們資料庫後Tamron的數值會有改變。
但即使如此，Tamron也有些了不起的表現，即使與市上最佳的70-200 f/2.8相較也沒被擊潰。

But let’s also remember that the Tamron is really a  70-175mm. A smaller zoom range helps the designer
maintain resolution throughout the range. Now, if you’re going to use a 70-200 for a portrait lens, or long
landscape lens, those few mm at the long end are probably of no consequence at all.
但請記住Tamron其實只有70-175，較小的焦段讓設計師可以保有全焦段的銳利度。
如果你要買一之70-200的人像鏡，或長焦風景鏡，差那幾mm可能沒什麼影響。

For other shooters, though, particularly those doing action sports on full-frame cameras, the difference could be critical. Cropping a shot an extra 10% is going to reduce final resolution significantly. As always, horses for courses.
但對其他使用者，特別是全幅機的運動攝影者，這個差別就很明顯。
多裁10%的圖會明顯地降低最終的畫素。
The Tamron, though, for a whole lot of people, is going to provide an exceptionally sharp lens at a lower price.
但對大部分的使用者，Tamron還是以相對低的價格提供了絕佳的銳利度。

Remember What This Is

This is a quick look at resolution only. If you’re like me, bad resolution is a deal breaker. Good resolution
just means the lens is certainly worth a closer look. Just like you, I’ll wait on the thorough reviewers to look
at flare, focus accuracy, bokeh, and the dozens of other things that are important in a lens. But I think both of
these lenses certainly passed this first test and are worth that closer look.
但請記住這只是解像力的快速測試，如果你像我一樣，解像力是很重要的因素的話。
好的解像力只代表這顆鏡頭值得再繼續研究下去，我跟你一樣，等待其他評測員來測試耀光、對焦準度、散景和其他對鏡頭來說很重要的測試，但我認為這兩支鏡頭都已經通過第一關，而且值得我們繼續看下去。