Here's something I've been working on this week, it's a spherical panorama tripod head that fits my Sigma 10-20 lens.
The principle of the thing is that it rotates the camera around the lens focal point (pretty far forward in the lens) so that there is no perspective shift between the many exposures necessary to create a spherical panorama; also it has a snap mechanism every 30 degrees both for the panning (horizontal rotation) and the tilt (vertical), horizontally it can of course turn around 360 degrees, but tilt is limited to -30 to +60 degrees, which is fine because normally I do the exposures at -30 and +30 degrees.

After printing and assembling I noticed a few areas for improvement, after I work on that I'll publish the STL files for the design.

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This is an HDRI spherical panorama I took with a similar tripod head (one we use at work), I haven't tested this one yet but I'm going on holidays in 10 days so I'll have plenty of time for that.
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