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Focusing an Off-Center Subject
When Autofocus Fails (Manual Focusing)
(3) With the following Extenders and L-series
lenses whose maximum aperture is brighter
than f/8, the center focusing point will be
sensitive to horizontal lines only. The other
focusing points cannot be used for AF.
• With Extender EF 1.4x:
· EF 400mm f/5.6L USM
· EF 500mm f/4.5L USM
· EF 100-400mm f/4.5-5.6L IS USM
• With Extender EF 2.0x:
· EF 300mm f/4 L USM
· EF 300mm f/4L IS USM
· EF 500mm f/4L IS USM
· EF 600mm f/4L USM
· EF 600mm f/4L IS USM
· EF 70-200mm f/4L USM
• When the < > button is pressed,
the display shown on the right
appears on the LCD panel.
Autofocus can fail to achieve focus (the in-focus indicator blinks) with
certain subjects such as the following:
(a) Low-contrast subjects (blue sky, solid-color walls, etc.).
(b) Subjects in low light.
(c) Extremely backlit or reflective subjects (car with a reflective body, etc.).
(d) Overlapping near and far objects (animal in a cage, etc.).
In such cases, do one of the following:
1. Focus an object at the same distance as the subject and lock the focus
before recomposing.
2. Set the lens focus mode switch to MF (or M on older lenses) and focus
manually.
If focus cannot be achieved with the AF-assist light of a Speedlite or ST-E2,
select the center focusing point. An off-center focusing point might not be able to
achieve focus.
SEC.03 P033-048 (E) 28-01-2003 16:04 Pagina 47