Thank you Craig for the report. It's actually quite valuable for someone to take
the time to do a controlled test, explain the methodology to the rest of us, and
summarize the results. I find it much more enlightening than the speculation that
sometimes masquerades as fact.
Geoff Doane
"F. Craig Callahan" wrote:
>
> Here are my unscientific results: (you're being too modest here)
>
> In order to have a lens with a maximum aperture of f/5.6, I attached the EF 2x
> extender to a 200/2.8L, mounted on an EOS 3. Using utility wires (conveniently
> located opposite my 3rd-floor balcony) against a blank white (overcast) sky, I
> found that focusing on horizontal lines was possible with all AF sensors...
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