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The focus is accurate at F1.4. This is a great lens that needs some tweaking as confirmed by Sigma Technicians in other threads. Some of us, not all, are experiencing severe backfocus when using outer focus points. This exists on my d800, but not on my d600.
On my d600, this lens works very well with all focus points. Some of us are waiting to see the results from other users who have sent their Sigma lenses in to get fixed specifically for the acknowledged d800 issue.
As of right now, I'm enjoying using this lens on my d600.
But then, with all due respect, if 1.4 does not provide reliable AF, what is the point of purchasing a 1.4 AF lens? I am pretty sure that when a 1.4 lens is stopped down to 5.6 the IQ differences with considerably more affordable and travel-friendly (weight and bulk) 2.0 or even 2.8 lenses almost vanish.
I am preaching to my own church here as I own all 1.4 primes, but I see myself not using 1.4 as often as I thought I would. Shooting wide open delivers a very specific style - and an even more particular style if AF...Show more →