55-250mm

55-250mm

我也用的是350D说白了就是为刚出生的女儿准备的，这个55-250还真把我给毒到了，本来打算70-200的，这样看来没必要上L头了，这个就足够用来抓拍了！！严重考虑中！麻烦楼主能否上点，55-250的这个头在85上的，普通室外图，别PS哦！先谢了！！！

实话说，这个帖子上的照片与春日午后兄http://forums.nphoto.net/thread/2007-12/09/ff80808116b5eada0116bebb7cd14a21.shtml完全不一样的感觉了。
如果55-250真有LZ这样的水平，怕是一般人都别去买白色镜头了。
2000不到真能出这样效果？成片率有多少？

没办法！咱是贫困户呢， 狗头能用到也是幸福啊

小帅哥！

头狗不狗还不知道，毕竟用的人少。反正LZ肯定是一牛人。

毒 确实很毒 别把此头整的涨价就行

自动对焦系统改变怎样？？？？

我水平差，不过感觉这个头挺好了。

55-250mm

Vignetting
Being a dedicated APS-C lens the Canon EF-S 55-250mm f/4-5.6 IS produces comparatively high vignetting close to 1EV at "large" aperture settings. This may be disturbing at times. Beyond the max. aperture it isn't really a problem anymore.

mtf01
MTF (resolution)
The lens produced pretty impressive resolution figures in the MTF lab. The resolution characteristic is generally very good across the image frame. Unsurprisingly the lens performs best at 55mm but there's only a slight deterioration towards the long end of the zoom range - surely the benefit of the large UD element in the front lens group. Subjectively the contrast level suffers somewhat at longer focal lengths though (not visible in the graphs below).
Below is a simplified summary of the formal findings. The chart shows in line widths per picture height (LW/PH) which can be taken as a quantity for sharpness. If you want to know more about it you may check out the corresponding

mtf02

Chromatic Aberrations (CAs)
The level of lateral chromatic aberrations (color shadows at harsh contrast transition) is very low and usually not field relevant at less than 0.5px on the average at the image borders.