This are typical Chinese non-electronic extension tubes. They come in many variations with different mounts.
There are two main parts: one with a camera mount, the other with a lens mount. In this case, both are Sony FE mounts. No electronic contacts, of course.
These parts have threads. Looks like M57x0.75, but I could be wrong.
And there are three intermediate tubes with the same threads. They are marked with the numbers 1, 2, 3.
It is possible to use these tubes to get the desired total length.
The shortest option uses the mount parts without intermediate tube.
The longest option uses the mount parts with all three intermediate tubes. The total (i.e. maximum) length is 64.3mm.
The extension tubes have few disadvantages.
1. The lens orientation relative to the camera changes depending on the intermediate tubes, and it is always wrong.
2. I don't know about other mounts, but the lenses have a lot of play on the Sony FE lens mount part. For example, with the Samyang 35/2.8 FE lens. It is just for demonstration, this lens doesn't work with the tube.
It is very annoying. I tried these tubes to estimate the length for the desired magnification. But for regular use I would prefer other tubes.
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