f/2.8 or faster is the magic number to activate precision focusing
behavior using the center focus point only. I didn't understand what
you're attributing to me so I can't say if I agree or not :-)
Chuck Norcutt
usher99@xxxxxxx wrote:
> Hi, I own an orphaned Cameraquest adapter only, sans 5D, as a
> preface to any remarks. I believe it reports f1.4 to the camera as to
> engage the higher precision AF mode---so it is imp't. Chuck thought
> the AF clue with a beep mechanism was OK with a reasonably discrete
> focal subject area to the best of my memory thus making a chipped
> adapter of more interest to me. The chips can be tweaked with the
> firmware to focus to different points. This may be more imp't than
> the chip people wished as it implies one may need a range of chipped
> adapters. How much the focal point may vary with different lenses on
> the same body is not clear to me. I don't think Johnny was too
> impressed thus far, though he did not purchase it from the UK site.
> I was hoping that the chipped adapter, angle finder, +/- Katzeye
> screen (none exists yet) would be a pseudo OM4Ti D that would serve
> as a nice body to use any OM glass, even the slower ones that can be
> problematic focusing with the 5D. Jeff hasn't rendered an opinion
> yet on his angle finder as a focusing aid which Johnny thought
> helpful though not a slam dunk as implied in a couple Pnet posts.
>
> Mike
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