Originally posted by Ed Hurst Firstly the hoods are fixed (not removable). Secondly I am not 100% sure that this is the only difference; it is often asserted to be the case, but some have suggested that there may also be other, more subtle, internal differences (perhaps around the baffles, internal non-reflective coatings, etc.). In short, they are not quite identical, but the extent of this is a matter of conjecture.
I have the DA version and find it very good. Not perfect, but very good and certainly good enough to use in those instances where the 28-45 is not wide enough. A really good 21mm f4 prime would be wonderful though!!!!
Indeed it would, but likely very heavy both in weight and price, but we can always dream!