Canon Camera Hackers Manual page 219

210
C H A P T E R 7
The SDM Synchronization submenu.
The functionality is nearly the same as
in the CHDK, only the SDM allows for
a dding extra flash delays.
The Stereo Data Maker (SDM)
ready to shoot. (3) When the button is released, the camera fires. It is
possible to combine steps (1) and (2) by full-pressing the button once.
A simple switch-and- battery remote control as shown in section 4.9.2.
f
(1) Press the button for less than half a second to focus. (2) Press the
button again to determine the exposure. The blue LED indicator will be
lit when the camera is ready to shoot. (3) Release the button to shoot. It
is possible to combine steps (1) and (2) by pressing the button for lon-
ger than half a second, waiting on the blue LED, then releasing the
button.
This mode of operation is true for the "normal" camera mode, also called
the DIRECT mode (you may have wondered what the DIRECT indicator in
the SDM header line means). In this mode, a photo is taken when the
switch is released.
In FAST mode, in contrast, a photo is taken as soon as the switch is
pressed. The FAST mode is entered automatically when
Override >
The remote system can be configured with the same parameters as
shown in section 4.9.3. Since this functionality was adopted by the CHDK
from the SDM, there are almost no differences between the versions. The
menu is structured differently, and the names of some menu items are
different. For example, the CHDK option Enable Remote Zoom is called
Synch Zoom in the SDM and is located in the Stereo submenu. The reason is
obvious: controlling the zoom function through the remote control allows
for synchronized zoom operation when two cameras are connected to the
remote control. This is an ideal way to set up twin cameras for stereo pho-
tography.
The other remote parameters are located in the submenu Stereo
Synchronization. There is one more parameter that is not present in the
CHDK: Add User and flash delays. This option can be enabled to facilitate
synchronized flash (section 7.7.5). For each camera, a special delay value
(depending on the shutter speed) is computed and added to the delay
values dialed in by the user.
Figure 7-3
Focus mode is set to Manual or to Digiscop.
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