優點:
Range: 55-250 is very common used in wild life shooting;
IS: useful (I tried 1/20 it still sharp);
Quality: Acceptable (it is not too fair to compare it with \"L\" lens);
Price: Major factor, why I chose it (for a Canon beginner-like me, may be this is the best choice).
缺點:
Build up: Not to solid;
USM: Important for me duing wild life shooting;
Focusing: slow in dark area;
評價:
Tele Lens: If you need a tele lens with IS function but only have limited budget - go ahead may be it will be one of your selections.
Image: F11 - F8 still have sharp image (centre and edge), over F5.6 it may be soft.
Overall: Good for beginner and limited buyer.