Canon EOS-1D Mark II Digial Conseils et techniques - Page 29

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bound to look softer than it would at greater viewing distances or lower magnification.

Therefore, if printed output, especially at 8.5" x 11" or less, is the final objective, it's

best not to rely completely on monitors to judge image quality. To prove this point, we

encourage you to compare your printed images to the on-screen versions.

Motion Blur

When high-resolution images are enlarged to 100% magnification on screen, image

defects of any kind are accentuated. One such defect that is often mistaken for

inaccurate focusing when viewed at smaller magnifications is motion blur. This can be

caused by subject movement and/or camera movement, and is especially likely to occur

at relatively slow shutter speeds. Remedies include shooting with a tripod to eliminate

camera movement, using an Image Stabilizer lens during hand-held photography to

minimize the effects of camera movement, and using either high shutter speeds or

electronic flash to freeze subject movement. Secondary "ghost" images in flash photos

can be minimized or eliminated by using faster sync speeds and/or lower ISO speeds or

smaller apertures to reduce the effect of ambient light.

Camera or Subject

The closer the subject, the more critical accurate focusing becomes. One potential

Movement After

problem to avoid is camera or subject movement after focus lock. This can happen more

Focus Lock

easily than one might think, especially during hand-held photography when the camera

is set for One-Shot AF. Even slight camera movement or subject movement after focus

lock can result in soft images, particularly when shooting at wide apertures with narrow

depth of field.

Diffraction is an optical phenomenon in which light waves pass around the edges of an

object and enter the shadowed area of that object

†

. In photography, diffraction flare

often occurs when images are shot at small apertures with short focal length lenses. The

visual effect is a softening of fine detail that cannot be corrected in post-processing. If

you are concerned about this optical phenomenon, we recommend avoiding apertures

smaller than f/16 with wide-angle lenses and wide-angle zooms.

†

EF Lens Work III

IV. SHARPNESS EVALUATION