Yes, trying to see if the Sigma 150-600mm is worth buying, or could I achieve the same results with the Powershot, since the 21-1365mm is optical, and not digital zoom. The Powershot has a smaller sensor, so I assume that would come into play, but if...
I own a t4i...I am looking at purchasing a zoom lens, not sure which one, either the canon 500, or the sigma 150-600....in either case, would the powershot xs60 negate the need for those zoom lenses, or does image quality suffer greatly at the 500/60...