am thinking of having a telephoto lens , and there are two lenses that am thinking about :
i saw many comparisons between the two lenses but till now i dont know which one is better for me
the canon is sharper and it has IS but i think its expensive
i found a used (Sigma 50-500mm f4-6.3 EX DG) for 680$
and for the canon i found only a new one for 1600$
so my question is : does the canon worth the extra 900$ if i want to get a new one , or you recommend the sigma for me ?
sorry for my english :P