QUICKREFERENCE GUIDE 3
Camera Operation Tips Select focusing points manually:
Selecting the focusing pointmanually speeds up the autofocus system because the
camera doesnot have to decide which focus point or points to use. Manual focusing point
selection also allowsyou to control exactly where the camera is focusing. If you would like
to selecttwo 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 pointexpansion.)
•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 Functionscan be combined to optimize camera operation according to various
applicationssuch as Action Photography and Event Imaging. Groups of Custom
Functionscan 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 contrastysubject is easier to focus on. This is particularly important in low light. If
your subjectis low in contrast, try focusing on its edge rather than in the middle.
Avoid recomposing after focus lock during portraiture or close-up photography:
Thistechnique can cause focusing errors when shooting subjects within 15 feet of the
camera, especiallywhen using large apertures to reduce depth of field. Instead, select
an off-center focusing pointor focus manually.
For maximum AFSpeed, use current USM lenses and avoid Extenders:
CurrentUSM lenses such as the IS super-telephoto series are optimized for maximum AF
speed when used with EOS-1 classdigital SLRs. In exchange for increasing focallength,
EFExtenders reduce lens drive speed and maximum apertures.
Practice your shutter release technique:
Pressing the shutter button halfwayprior to shutter release improves AF tracking
accuracyand shutter button response, especially in AI Servo AF with moving subjects.
Itcan also reduce the potential of camera shake.
QUICK REFERENCE GUIDE