Ja tylko zacytowałem specyfikację, za www.the-digital-picture.com jak zresztą widać.
Tudzież jeszcze:
45-point TTL
19 cross-type points, require F2.8 or faster lens *
centre cross-type point requires F4.0 or faster lens
26 assist points, require F5.6 or faster lens *
TTL-AREA-SIR with a CMOS sensor
AF working range: -1.0 to 18 EV (at 23°C, ISO 100)
http://www.northlight-images.co.uk/Canon_1DS_MkIII.html
Number of AF points: 45 (inside of ellipse area of focus screen); 19 high-precision cross-type points (require f2.8 or faster lens for cross-type coverage); 26 assists points (require f5.6 or faster lens)
http://www.northlight-images.co.uk/Canon_1DS_MkIII.html
Canon has redesigned its auto focus system to include 19 cross-type sensors with sensitivity up to f/2.8, spread out across the AF area to better accommodate off-centre subjects. An additional 26 AF assist points are used to aid AF tracking for improved accuracy.
http://www.dpreview.com/news/0702/07...s1dmarkiii.asp
The 18 cross-type AF points other than the center AF point detect vertical lines at f/2.8 and horizontal lines at f/5.6. If the maximum aperture of the lens or lens/extender combination in use is f/2.8 or larger, high-precision, cross-type focusing is possible. Also, if the maximum aperture of the lens or lens/extender combination in use is f/5.6 or larger, horizontal-line sensitive AF is possible.
http://www.robgalbraith.com/public_f...hite_Paper.pdf strona 18
Dziś miałem ciężki dzień, ale chyba nie aż tak...![]()
Chciałbym przy tym zwrócić uwagę, że ani dla 40D ani dla D300 jeszcze tak szczegółowy diagram punktów AF nie został opublikowany (lub przynajmniej mi się nie udało znaleźć).