Camera Operation Tips
QUICK REFERENCE GUIDE
Select focusing points manually:
Selecting the focusing point manually speeds up the autofocus system because the
camera does not have to decide which focus point or points to use. Manual focusing point
selection also allows you to control exactly where the camera is focusing. If you would like
to select two focusing points at once, you can shift the focusing point up or down one row.
Use Custom Functions to improve AF control and speed up camera operation:
• C.Fn 4 operates AF and shutter release separately for greater control.
• C.Fn 13 speeds up focusing point selection by reducing the number of manually
selectable focusing points.
• C.Fn 17 expands the active area around manually selected focusing points.
(For maximum control, use C.Fn 17-0 to disable focusing point expansion.)
• C.Fn 19 adds AF control features to compatible EF lenses.
• C.Fn 20 provides more control over AI Servo focusing sensitivity.
• C.Fn 21 controls the priority of framing rate over predictive AF.
Custom Functions can be combined to optimize camera operation according to various
applications such as Action Photography and Event Imaging. Groups of Custom
Functions can be saved in the camera and selected quickly when needed.
Try to find a point on your subject with a high degree of contrast:
A contrasty subject is easier to focus on. This is particularly important in low light. If
your subject is low in contrast, try focusing on its edge rather than in the middle.
Avoid recomposing after focus lock during portraiture or close-up photography:
This technique can cause focusing errors when shooting subjects within 15 feet of the
camera, especially when using large apertures to reduce depth of field. Instead, select
an off-center focusing point or focus manually.
For maximum AF Speed, use current USM lenses and avoid Extenders:
Current USM lenses such as the IS super-telephoto series are optimized for maximum AF
speed when used with EOS-1 class digital SLRs. In exchange for increasing focal length,
EF Extenders reduce lens drive speed and maximum apertures.
Practice your shutter release technique:
Pressing the shutter button halfway prior to shutter release improves AF tracking
accuracy and shutter button response, especially in AI Servo AF with moving subjects.
It can also reduce the potential of camera shake.
QUICK REFERENCE GUIDE
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