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| p.2 #3 · Two fast 35mm lenses reviewed at Photozone |
I wouldn't be surprised if body makers decided to give their own lenses and advantage by incorporating screwy algorithms to make 3rd party lenses focus unreliably. If you can't beat them with a better lens, then hobble the competition.
Under the assumption that Canon has no obligation to coordinate with Sigma (or anyone else), there's no blame here. Really, if a third-party lens fails to properly focus, the onus is on that lens' manufacturer. They should have gotten it right before they released it.
And if you want to compare a relatively old Canon design to a sparkling new Sigma design- note that there's optical qualities that the Canon's have that the Sigma doesn't, including CA control and background rendering, along with focus speed (let alone accuracy and consistency). If you look at another example, say Sigma's 24-70/2.8 and Canon's, there's simply no contest; the Sigma is so far behind that OS can't help it.
Now, don't accuse me as labeling Canon as 'ethical'- no well-run business is. But they have no obligation to tailor their products in support of third-party lenses, and they're far from being eclipsed by Sigma.