+ CANON 15-85mm f/3.5-5.6 USM IS + SHARPNESS TEST PART 2 +

Here is the PART 2 of the sharpness test.
The distance of the camera and the books is about 1 meter. Focusing point was set to be at the center. All pictures were taken based on CANON 15-85mm lens' largest aperture. TOKINA 11-16mm f/2.8 was compared with CANON 15-85mm for focal length = 15mm.

這次在室內測試一公尺左右的距離，對焦點設定在中心，TOKINA 11-16mm 加入15mm 的比較。測試結果如下：

FOCAL LENGTH = 15mm



CENTER (100% CROP)



CORNER (100% CROP)



FOCAL LENGTH = 17-18mm




CENTER (100% CROP)




CORNER (100% CROP)




FOCAL LENGTH = 50mm




CENTER (100% CROP)




CORNER (100% CROP)




CONCLUSIONS:
1. Each lens produces good sharp image at the center.
2. TOKINA and TAMRON seem to stand out for the sharpness at the corner.

測試的結果，每支鏡頭的銳利度都已經在水準以上。
雖然用TOKINA 11-16mm這支來跟CANON 15-85mm比廣角的銳利度，有點以大欺小，不過也是個參考。
CANON 15-85mm 在1公尺距離的表現，總算比較符合各大網站測試結果。
TAMRON 17-50mm 也比較符合各大網站測試結果、及給他的高評價。
SIGMA 17-70mm 依舊表現穩定，沒有意外。



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