1) Two stage release button: halfway pressing for auto focus
2) Complete pressing takes the picture
3) Lock the button for continuously shooting or for long exposures when in the "Bulb"
4) Fully compatible with Canon cable release RS-80N3
5) Compatible cameras:
a) Canon EOS 5D, 1D, 1D Mark II, 1Ds, 1Ds Mark II
b) Canon EOS 20D, 10D, D60, D30
c) Canon EOS 1V, EOS 3, EOS D2000
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