« on: February 17, 2013, 01:56:57 PM »
I'm in luck: a few puffs of the rocket blower removed it. I think it was on the mirror.
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The 50L needs to be used wide open, at f 2.0 - 2.8 the extra cost is for the bokeh. Also focus shift can be an issues at those f stops.
The 50L is awesome, but damn you pay for that little extra. Stopped down the 50/1.4 is 95%+ of the 50L. I have no experience wit the sigma 50.
If your body has it, I'd set AFMA for about a four foot subject distance @f/1.4. Then shoot something at about 40 feet @f/1.4. If it's way OOF at 40 feet, knowing what I know now about the issue, I'd say just send it to Sigma USA as long as you like what you see at 4 feet. They now have a very good fix for this issue in my experience and if you like what you see at 4 feet its probably a copy worth keeping imo.
The only time it doesn't produce results where its bristling with detail is when shooting wide open near MFD.
I was really hoping Canon would come out with a new 50/1.4, or that Sigma would update its 50/1.4 to the "Art line" with similar quality to their new 35/1.4. No luck on either front — so far, at least.
So am I. There is something for Canon or Sigma to win here. Let's hope 2013 will bring some news on that
Also, each unit of AFMA is 1/8 the depth of focus. So, anything over |8| units of AFMA means the lens is outside the accuracy spec for the AF system.