Canon EOS 30D Instruction Manual page 221

4. Close-up Photography (Macro Photography)
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The lens can focus as close as 0.5 m/1.6 ft for close-ups (macro
photography).
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5. Full-time Manual Focusing
Full-time manual focusing allows you to focus manually even
when autofocus mode is selected.
To use full-time manual focus:
1. Set the camera to ONE SHOT AF mode and press the shutter
button halfway.
2. Keep the shutter button pressed halfway, turn the focusing ring
to focus manually.
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