T
tooslick2k
Guest
jrista said:For one, the 7D AF is designed for an APS-C sensor, mirror, and viewfinder. I don't believe it would work without modification on a full-frame sensor camera, given point spread and mirror size/design and the like. From what I understand about AF units, they have to be designed for the size of the sensor and mirror unit. Given that, I don't think its quite as simple as simply using an already-designed AF unit from an APS-H or APS-C camera and just stuffing it inside of a 5D. It would take some development effort to develop a 7D-like AF unit for the 5D III to make sure it has the right frame spread, works with the larger 5D mirror, etc. Thats ultimately where my confusion boils down...sure, it would be nice to have 7D AF...for a 5D II price...but they would have to design something 7D-like FOR THE 5D III.
The only other high-speed full-frame AF unit that I know of from Canon is the 1D X unit...so the options are fairly limited... You either develop a new 7D-style 19-point unit for the 5D, or suck in a far more advanced and considerably more expensive model from the 1D X (which would never happen, but for arguments sake). Either way, you increase the cost of the 5D III by a fairly considerable amount.
I agree, getting a 1DX AF would NEVER happen. However when the only argument about the 5D2 not being perfect is that it has an outdated AF.
I think if the price went up to account for a 19pt AF in the 5D3, I dont think it would affect anyone from not spending the extra money. After all its what everyone wants.
Upvote
0