« on: May 03, 2013, 08:04:54 PM »
I ran into a similar problem and went this route (Brands I used):
Arca-Swiss compatible L-Brackets (ProMediaGear). As mentioned above, it does allow landscape and portrait positions on tripod. If your tripod is Arca-Swiss compatible, then you're good. I had Manfrotto tripods and heads so I had to get adapters (Kirk).
Also highly recommend ProMediaGear's Boomerang flash bracket. Fits the L-Bracket and is the quickest landscape/portrait switch that I've seen.
Dual camera holsters belt with the Arca-Swiss Clamps (Spiderholster). The clamps are quick release so that you can mount the camera to the tripod and then back to the straps very quickly.
Double straps harness DR-1 (Blackrapid). This attaches to the Spider clamps. If not using the clamps, you have to unscrew the Blackrapid and will be slower.
I, also, am paranoid about having a single point of attachment. With this setup, I made a 1" loop with a long velcro strip, wrap it around about 3 or 4 times, around the corner of the L-Bracket, then bought a small, high-strength carabiner and attached it through both the Blackrapid carabiner and the velcro. Now, if the Blackrapid or Spider clamp fails, the L-bracket should save the camera. Wasn't meant to be if the L-bracket fails!
This setup gives me a lot of confidence about not dropping the cameras. Single camera version of this setup is great, too. I'll attach a Lowepro Lens Exchange 200AW to the opposite side for easier lens changes.
Hope this was helpful and gives you some ideas. It's also very comfortable.