« on: August 15, 2013, 09:47:31 AM »
Will there be 200-400mm f2.8 ART for $4000?
That would be too large and heavy. How about a 200-500 f/2.8-4, where the aperture is constant (maximum of 2.8 ) between 200mm and 350mm, then allowed to increase gradually to f/4 as FL increases to 500mm? Even that would be larger than the 200-400s from Nikon and Canon. (I've been suggesting a lens like that to Sigma for about 3 years.)