Canon EOS-1D Mark II N Manual De Instruções

89

Autofocus can fail to achieve focus (the focus confirmation light <

o

> 

blinks) with certain subjects such as the following:

(a) Low-contrast subjects

Example: Blue sky, solid-color walls, etc. 

(b) Subjects in low light 
(c) Extremely backlit and reflective subjects

Example: Car with a reflective body, etc. 

(d) Overlapping near and far objects

Example: Animal in a cage, etc. 

(e) Repetitive patterns

Example: Skyscraper windows, computer keyboards, 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 <

g

> and focus manually. 

If focus cannot be achieved with the AF-assist beam of a Speedlite or 
Speedlite Transmitter ST-E2, select the center AF point. An off-center AF 
point may not be able to achieve focus.