On Tue, May 8, 2012, at 09:59 PM, Moose wrote:
> On 5/8/2012 11:59 AM, Joel Wilcox wrote:
> > On Tue, May 8, 2012, at 11:05 AM, Moose wrote:
> >
> >> ... My Big-IS adapter has been working fine in Av mode. I do have to lie
> >> when
> >> using it with the 600/8, and say it is f5.6,
> >> though or the camera refuses to focus confirm.
> > My adapter regularly will confirm focus at 5.6 and occasionally but not
> > always at 8. I'm sorry yours won't,
>
> Slight misunderstanding.
>
> Canons refuse to focus confirm a lens of less than f5.6 max aperture, as
> a matter of principle, written into their
> firmware. However, I can tell the adapter, which tells the camera, that
> the lens is f5.6, then set the camera Av value
> to f8. It then happily focus confirms at the actual f8 until the light
> gets too low and records the correct aperture in
> the EXIF.
Gotcha.
Joel W.
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