16
Lenses / Re: How about Sigma 50mm f/1.4 EX DG HS
« on: March 31, 2012, 07:14:03 PM »
My Sigma 85mm f/1.4 is spot on (no MA needed) but my 50mm has front-focussing issues at f/1.4. I set my cameras to +20 but that was enough, I think it needs about +25. Tried another copy, same issue. I can live with it until I get a Canon 50L although these are still 2,5 times more expensive secondhand than a new Sigma. I definately prefer the Sigma over the Canon f/1.4 I had before because of the bokeh and a better focus ring.
The optics are identical in both versions. At least, Canon made no official statement to the contrary, and the size, weight, number of elements and groups, and most importantly, the MTF curves, are identical. Ok, the MTF curves are not exactly identical, because of an error on Canon's website (honest mistake, or trying to make the lenses look different?) - the 55mm MTF on one is identical to the 250mm MTF on the other, and vice versa.

