> "F. Craig Callahan" <[EMAIL PROTECTED]>
> What remains intriguing is the question of what happens between max
> apertures of f/4 and f/6.7. The EOS 3 manual states that at maximum
> apertures of f/6.7 to f/8, the center CT sensor is sensitive to horizontal
> lines only, and "the other focusing points cannot be used for AF." ...
Hi Craig,
To see if 44 of the 45 sensors on the EOS 3 shuts off beyond f/5.6, as
per spec, you will need to mount an f/8 lens.
I guess that means f/5.6 with 1.4x TC, or f/4 with a 2x TC.
What aperture is reported for the combination of:
200mm f/2.8 + EF 1.4x + 25mm extension + EF 2x
Cheers
Julian Loke
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