----- Original Message -----
From: "Willem-Jan Markerink" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Wednesday, October 04, 2006 2:02 PM
Subject: Re: EOS f2.8 limit for AF-sensors
On 4 Oct 2006 at 15:28, [EMAIL PROTECTED] wrote:
---- Willem-Jan Markerink <[EMAIL PROTECTED]> wrote:
> Haven't checked this specification for a long time, but with the
> EOS-1(n), there was a limit of f2.8 for the AF-sensor, being
> functional with both vertical and horizontal lines. On the
> PhotoKina, the Canon guys looked at me as if they saw water burning,
> when I mentioned this in the context of the new 70-200/4.0 IS....as
> if there never was such a limit, for more than one generation....
> Yet I don't even recall any big boasting of this limit being
> nullified with any of the later EOS-1 series.... I do recall vaguely
> that the medium grade models suffered less from this, but only by
> comprimising low-light performance....the center sensor of the EOS-1
> was much better in that context)
>
>
IIRC, the EOS3, and subsequently, the 1v, had a lower limit of f8, but
I don't know if that carried over to the digital versions. As far as
I know, all other models, Elan7, 30D, 5D, etc have that f2.8
limitation. Skip Middleton
Hmm, yes, but did this f8 limitation not apply to the outer/excenter
sensors only?
Including being much less light-sensitive, the cross-sensor still
beating them (and all the lower grade models)?
--
Bye,
Willem-Jan Markerink
Willem, I think you're looking at it upside down. And that was compounded
by me not being clear in my own thinking. The camera will AF at apertures
as small as f8 on the center sensor, but it requires f5.6 as a minimum for
AF. F2.8 is required for cross sensors on the center for the lower line
models...
Skip Middleton
www.shadowcatcherimagery.com
www.pbase.com/skipm
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