Well, talking more mid-range here, but I figured a cross sensor's a cross sensor. Would Canon build one good and one a bit better? Is it economical to do this? I was just wondering what gives the Pro models this f8 AF ability. Just wondering that's all...
The max aperture has nothing to do with the sensitivity of the material used (CMOS vs CCD) but rather the angle of separation used in the sensors. You can imagine them to be mini-rangefinders. The longer the baselength, the more accurate they are, but also the wider aperture opening they need. The high-end EOS actually have the capability to handle multiple apertures, although they are at their most accurate with f/2.8 or above.
The cheaper consumer bodies use a simpler design. Canon has at least three levels: Pro (1v/3); Prosumer (5/7); and Consumer (KISS/Rebel).
Karen Nakamura www.Photoethnography.com
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