« on: June 02, 2012, 08:32:05 PM »
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Sigma has refinished this lens in 2010. The new version is much better in IQ and AF. I actually just google the new version of Sigma 50mm. Looks no big issue on AF. Google is your good friend.
It could possibly affect the used price of the MK I. Not saying that it will be cheaper after the MKII hits the street but perhaps it won't increase in price as much as it is expected with the release of a much more expensive replacement.
On the other hand, perhaps Canon will continue selling the MKI which could be interesting.
The light doesn't need to be on all the time. Just a short flash upon AF-start..as it was with the 5D. And light metering can happen before and after the short AF point flash.I don't know if you shoot fast action sports but it's valuable and highly productive to have the red AF point stay illuminated on as it does on the 1D4 when shooting AI Servo with a single selected focus point or cluster. You simply have to keep sight of your selected point and keep it on the part of the action you're tracking. It all happens blindingly fast. By the time you re-activate a disappearing focus point the touchdown or goal has happened, the hurdles race has flashed past you, the race car has vanished...you get the idea? Constantly visible AF points are one of an action shooters prime productivity tools.
5D2 outer points fail to lock on many subjects which can be annoying, 5D3 ones tend to lock.