Specifications

Audio recording
Focusing
The EOS-1D Mark IV has an amazing top ISO of 102,400. This sensitivity is available for
both video capture and stil
l photos, making the camera a great tool for shooting videos, as
well as stills, at night. Intrepid journalists and documentarians in search of those aspects of
human nature seen infrequently, as well as the usual police and fire drama, will find the
EOS-1D Mark IV a superb professional companion.
Audio recording is possible with the built-in microphone (positioned just below the EOS-1
logo on the front of the camera) or with a range of commercially available external micro-
phones connected to the camera via a 3.5mm stereo plug. Audio recording can be turned
ON or OFF with a menu item, [Sound recording: On/Off ]. Sound is recorded in linear
(uncompressed) PCM that has no audio degradation and facilitates extraction in bit parts
and editing. The sampling frequency is 48 KHz, and the bit count is 16 bits for both Left
and Right channels. With the built-in microphone or an external microphone, the sound
volume is adjusted automatically.
The built-in microphone records monaural sound. The audio IC has a wind shield feature
that reduces wind noise automatically during outdoor shooting. There is also a feature to
automatically reduce aperture drive noise in video clips recorded with the built-in micro-
phone, a feature that’s available for the first time in an EOS Digital SLR. However, the
built-in microphone may still pick up noise from operating the camera dials, lens, Image
Stabilizer, AF motor and so forth.
A commercially available, electret condenser microphone with a 3.5mm diameter stereo mini
plug can be connected as an external microphone. Because the camera provides plug-in
power, it is compatible with most electret condenser microphones. The camera cannot use
dynamic or phantom-powered condenser microphones. The wind shield and aperture noise
reduction features will not work with an external microphone.
Before video shooting starts, focus can be achieved in Live Mode AF, (face detection) Live
Mode AF, or Quick Mode AF by pressing the shutter button halfway or by pressing the AF-
ON button. If you attempt to autofocus
during a video recording with the 1D Mark IV
set to Quick Mode AF, the camera will switch
automatically to Live Mode AF. During
video shooting, you can press the AF-ON
button to focus again. (Pressing the shutter
button halfway will not operate AF while
recording videos.) However, doing so may
throw off the focus temporarily and/or
change the exposure. Note that the built-in
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IV–3. EOS HD VIDEO CAPTURE
AF/Drive