Ok I will try the cleaning technique but I'm doubtful that will work.
This morning I tried it again. 17-40 lens no workie.
Put the 50mm on and works fine. So it is making connection the the hot shoe but only with the 50mm attached.
I'm baffled by this one.
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Canon EOS 7D
EF 70-200 L f2.8 IS USM, EF 17-40 L f/4 USM
100mm f/2.8 Macro Lens, 50mm f1.4, SLR Zoom Gorilla Pod, Cactus V4's, Speedlites 580EXII & 430EXII, Manfrotto 190XPROB w/496RC2 Ball Head
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