優點:
1/ Good pricing - HKD 2,350
2/ Sharp - when aperture stop down to F/4 or above
3/ Light weight - 440g only
4/ The picture color is outstanding
缺點:
1/ Relative noisy when focusing
2/ Slow focusing speed but acceptable
3/ Lens extend a little outward when zooming
4/ Image relative soft when aperture set to f/2.8
Remark: The deficencies mentioned above are minor to me, do not bother me much
評價:
It is a great lens with rich color. I bought it last year in HKD 2,350, which is less expensive than 1/2 of Canon 17-40. I compared two lens apple to apple in the camera shop, I did not find any significant difference in image quality.
I used it as my walk around lens in my 450D. The picture quality is 100% satisfied my expectation. I recently upgraded to 50D, this lens works very much than before. Perhaps it comes from the difference bewteen 50D and 450D.
I really enjoy using the lens. Years or later when I upgrade to 5D or above, this lens surely can bring me additional "Ultra Wide Angle photography" fun