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If you wish to assemble your own exposure cable you will need to obtain the parts
(all available at Tandy/Radio Shack) and have basic soldering skills. This
section covers the serial cable portion for the 300D. Additional modification
of a remote bulb cable is necessary for other models(ie 10D, D60, 1Ds, 1dMk2,
etc)
Parts:
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One Resistor: 47Kohm
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One transistor: 2N3904
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One Diode: 1N4005
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One 2.5 mm Stereo audio plug.
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One 2 or 3 conductor wire (only 2 used)
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One D-9 female serial connector
Threre are several other cable designs on the internet with pictures and
instructions. Here are a few of them. We highly recomend the serial version as
it is much more reliable and works with USB/Serial adapters for Legacy-free
laptops.
Parallel & Serial
cables on DSLR Focus Site
Modifying canon remotes for non-300D cameras
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