sk66
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I've modified a dual camera harness to function as a dual point load equalizing system for carrying big setups. The idea is based upon load equalizing climbing anchors.
This is a generic e-bay black rapid clone I bought to use as a prototype. You simply have to shorten the side loops (remove the clips) and then add webbing between them with adjustable/sliding fittings. Depending on the harness you get, you'll probably have to cut and resew some webbing or attachment points. And it's a good idea to roll/stitch the end of the webbing so it can't slip back through the adjustable fittings. I used a snap buckle on one end to make it easier to put on/take off. I've used both clips so that one can be attached to the camera body and the other to the lens foot, but I think I prefer only one attachment to the lens foot at the balance point (using an arca swiss type StrapClamp). This really works quite well and it will be how I carry the really big setups (i.e. 400/2.8 + D5), and probably the moderate setups when I'll be carrying it for longer periods (Sigma 60-600 + D850). It's a pretty easy DIY if you have the ability to sew heavy webbing.

With the camera attached the load is shared equally by both shoulders and across the back. The camera can be placed to either side, or in front, and the load is still shared equally.
The principle is shown in the next 30 seconds of this video. Imagine the two shorter white loops as the shoulder loops and the red rope between them as the added webbing in between.
https://youtu.be/SUygS_Zydjs?t=115
I've ordered an OpTech dual camera harness to modify next. Partly because I don't really trust the cheapo clone I used, but also because I don't really like BR as a company and I don't like their clips. Plus the OpTech harness is much cheaper and I generally like their products. I've already filed the provisional patent paperwork; but if you want to make one for yourself, I can't stop you
This is a generic e-bay black rapid clone I bought to use as a prototype. You simply have to shorten the side loops (remove the clips) and then add webbing between them with adjustable/sliding fittings. Depending on the harness you get, you'll probably have to cut and resew some webbing or attachment points. And it's a good idea to roll/stitch the end of the webbing so it can't slip back through the adjustable fittings. I used a snap buckle on one end to make it easier to put on/take off. I've used both clips so that one can be attached to the camera body and the other to the lens foot, but I think I prefer only one attachment to the lens foot at the balance point (using an arca swiss type StrapClamp). This really works quite well and it will be how I carry the really big setups (i.e. 400/2.8 + D5), and probably the moderate setups when I'll be carrying it for longer periods (Sigma 60-600 + D850). It's a pretty easy DIY if you have the ability to sew heavy webbing.

With the camera attached the load is shared equally by both shoulders and across the back. The camera can be placed to either side, or in front, and the load is still shared equally.
The principle is shown in the next 30 seconds of this video. Imagine the two shorter white loops as the shoulder loops and the red rope between them as the added webbing in between.
https://youtu.be/SUygS_Zydjs?t=115
I've ordered an OpTech dual camera harness to modify next. Partly because I don't really trust the cheapo clone I used, but also because I don't really like BR as a company and I don't like their clips. Plus the OpTech harness is much cheaper and I generally like their products. I've already filed the provisional patent paperwork; but if you want to make one for yourself, I can't stop you
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