Recent patents suggest that Panasonic is working on built-in variable ND filters for their cameras. From the body design that we see in the patents, we expect that they will consider their full-frame series first to introduce these built-in ND filters, and after that, we may see them in the GH series too.
Panasonic and Canon have also filed a patent for built-in ND filters. From the design patent, it’s very clear that they want to add their variable ND filter in upcoming professional consumer-grade cinema cameras.
Currently, two main companies produce electronic ND filters for cameras. One of them is Sony. Electronic ND technology is used in many Sony movie cameras. The other is LC-Tec of Sweden. The electronic ND filters on many non-Sony cameras come from LC-Tec
In terms of mechanical ND filter, we have cameras like Canon C70 and black magic 6K PRO.
Canon one
Stay tuned more updates coming
Also see – Canon Patent Neckband Style Camera
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Olympus has had electronic ND filters for a few years. The Fujifilm X100V also has a built-in ND filter.