This kit can only be used for cameras that have the tripod screw at the center of the lens so they can be placed bottom-to-bottom with perfect alignment without needing any offset. 

Examples of cameras I have experience with: 

  Most Panasonic GF and GX series. For example, GF1, GX1, GX7, GX8, etc. Also, most Samsung NX cameras. Canon DSLR cameras. Many Sony cameras: RX0, RX1, A6000, etc.

The main advantage of putting the cameras bottom-to-bottom (vs. side by side) is to bring the lenses closer together and get a normal stereo base. For example, the Sony RX1 cameras when placed side-by-side, the lens spacing is 130mm. When placed bottom to bottom, the spacing is 66mm, which happens to be the spacing of my eyes!

  The disadvantage is that your pictures have a portrait format.  This is good for portraits and not so good for landscapes, etc.  But with some cropping you can get good results in many situations. If you are using the cameras bottom to bottom and are mainly interested in landscape viewing format, then you should consider switching the aspect ratio to 1:1. This way you get to compose the pictures better, exposure and focusing will be more accurate and you will not be spending a lot of time cropping. I have been using my Sony RX1 and RX0 camera this way and I really like the vertical format! (I am in the last picture)

You are getting the following in this kit:

• Five screws (all 1/4x20     size):
      - 2x steel 1/2" length (~12mm)
      - 1x steel 5/8" length (~16mm)
      - 1x steel & 1x plastic 3/4" length (~19mm)   

• One hard round rubber friction pad (2mm thick)   

• One soft square rubber pad (0.7mm thick)   

• 2x cardboard pads (0.55mm thick)   

• 3x paper (green) pads (0.11mm)

• 2x plastic coated thin paper pads (0.08mm)   

• A piece of rubber that you can use to remove the screw if it appears to be "stuck" and you want to separate the cameras

This is enough material for two pairs of cameras

The goal when using the cameras bottom-to-bottom is to use the minimum amount of material to bring the lenses as close as possible. Normally you need one screw and one or more of the supplied "friction pads". The friction pads come in different thickness and are used to 1) Get the alignment of the cameras right, 2) Provide a friction force that keeps the cameras from rotating.

It is a bit of trial and error to find the right combination of friction pad materials, that's why I have included a variety of them. You can also use common materials like paper and cardboard and punch a hole using a hole (~6mm dia) puncher. As a rule of thumb, a piece of paper is around 0.1mm thick. Cardboard can be 0.2-1.0mm thick. 

It is useful to remember that one complete revolution of the camera around the screw is ~1.3mm (that's because these screws are 1/4-20, so they have 20 threads per inch, 1/20" = 1.27mm). So if when the cameras are tighten, they have gone a bit past their alignment, add pieces of cardboard or paper, as needed, to bring them to good alignment.

A few comments about screw length and friction pads:   

• Most camera tripod sockets are about 7mm deep. So, the 1/2" (~12mm) screw should work in most  cases (that's why I included two of them).   

• At first, I made the mistake to use very short screws, trying to avoid using too many rotations of the     cameras. But then the cameras are only supported by the end of the tripod threads and they can get damaged, especially if the cameras are heavy (case of the Sony RX1). I now recommend that you try to use the entire tripod socket length. I have included longer screws, in case you use thick     friction pads. If you are convinced that you need shorter screws, you can cut one of the longer screws in half, but I do not recommend it.   

• Sometimes, the screw gets stuck and slides when you try to unscrew it with your fingers. I have included a piece of rubber that allows you to grab the screw better and unthread it.   

• You might find that with time     the cameras get loose. You might need to add a piece of paper to increase friction a bit. Be careful not to over tighten the cameras! Remember, if you damage the camera's tripod socket, you will not be able to use the camera in this configuration, so be gentle and careful.

To attach the cameras, follow these steps:   

• Before you start, experiment, starting with the 1/2" screw and see what kind of friction pad materials you need to bring the cameras in good alignment   

• Start by putting the friction pads at the center of the screw you are going to use.    

• Screw this into one camera.   

• Screw the second camera by turning it / rotating over the part of the screw that comes out of the first camera.  Keep turning     (rotating) until the cameras are aligned.

I am showing a few pictures that I have taken with cameras bottom-to-bottom and some information to help you use the supplied material. I really like this configuration and I hope you like it too.! If you have any questions, feel free to ask.

Please see my other ebay listings for similar items

I buy/sell/service 3D photography equipment

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