Well, I finally broke down, and since Canon had come up with the new G12 update to the G11 I have been using all along rather than my SLR , I bought one, and modified my slide bar to accept the 2 cameras. The first tests are good, and I will soon start to shoot some live stuff...
For the 2 camera setup, I first made a very lightweight mini slide bar on a quick mount plate for my extra light Manfrotto 785B tripod(highly recommended, feather weight, and extremely rigid for its skinny legs) using only a 1" length of 3"x3" aluminum angle and a bent piece of 1"x 1/8" aluminum drilled to level the 2 lenses, and with a slot and thumb screw to adjust the spacing. For even more spacing, the G11 can be mounted on the other side of the flipped around bracket:
Then I used the same brackets to reverse one of the 2 cameras so the lenses could get as close as possible on the original slide bar. In the horizontal position. That is a spacing of 3.25".
I then adapted the 90 degrees brackets I already had to fit the 2 cameras vertically with the lenses level, and a minimum spacing of 2.65":
This required the addition of a u channel spacer:
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