>> Julian Loke wrote:
>> With your 20-35 f/3.5-4.5 set to f/4.5, will your EOS 3 focus on
>> vertical-only detail with ANY of the 45 sensors?
> "F. Craig Callahan" <[EMAIL PROTECTED]> wrote:
> It does seem to, using the center focus point, and at times even with
> other focus points; however, I found it surprisingly difficult to find
> suitable targets with which to conduct this little test (how do I know
> it isn't seeing some horizontal element), plus it's night as I write
> and the lighting is by ordinary household lamps. So I wouldn't call
> this conclusive. :-)
Hi Craig,
I find that the edge of a wall or window or door gives vertical-only
detail. Black electrical tape on, or a book leaning against, on a
mirror works fine too.
You can confirm that there is no horizontal detail by trying to focus
on your target using a horizontal-only sensor. If it refuses to lock
focus with the camera horizontal, try again with the camera vertical
to make sure that there is only vertical detail.
I eagerly await the outcome of your experiment to answer the question:
Does the EOS 3 have any vertical AF sensors at f/5.6?
Cheers
Julian Loke
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