slrl0ver Offline Upload & Sell: Off
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Hi RDKirk,
Disclaimer: I'm an Engineer and I have worked on focus systems and control-loops in the past.
Although the AF system no doubt requires power, having more focus points I think would NOT be a huge power draw since it's not implemented using a contrast method that P&S cameras use (high-pass filter, edge detection algorithm). The phase detection mechanism isn't inherently a power hungry solution.
For AI-servo, I think the increased power draw from the motor might noticeably affect battery life, but probably the biggest hit would be from faster FPS. Increased FPS would mean more buffering, more processing, more shutter actuations per unit time.
EOS 1v has the 45-point AF and it's not a power monster.
- slrl0ver
RDKirk wrote:
It just occurred to me that one of the penalties of "professional autofocusing" as Canon currently engineers it probably requires significant power (given, for instance, that it must drive a very fast shutter and power two processors).
That is, it has up until now. But we also have a 5D2 that is amazingly efficient, perhaps as much as 75 or 80 percent more efficient than the 5D1 (comsidering the number of exposures we can get out of the mah of an LP-E6).
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