小弟本身是拿Tamron A16的
大大的測試圖中,看到邊緣的測試比較圖,真的是覺得A16差太多了....
但是在一個英文網頁看到一篇文章,不知道是不是和大大的測試有關連
http://www.photozone.de/8Reviews/lenses/tamron_1750_28/index.htm
裡面有提到:
On the downside the extreme corners showed a very strong degree of field curvature at 17mm and a little less so at 24mm. This means that the focus plane isn't flat but it bends towards to corners.
As a consequence you will end with out-of-focus corners when shooting flat or very deep objects at large aperture settings (see the 17mm f/2.8 sample shot below). The problem will be reduced when stopping down thus increasing the depth-of-field around the curved focus plane.
小弟的英文不好,雖然有查字典,但還是沒辦法看的很懂....
它主要是在強調「對焦面不是平滑」的這件事嗎?
如果是這樣邊緣表現會不佳就說的通了
因為對焦是對在正中央,而邊緣是失焦的...
但又覺得不合理
這個問題從買A16開始就一直困擾著我,
不知道是否還有機會把A16的性能再發揮更大一點
請各位大大幫我指點一下,謝謝。

























































































