Benro are coming out with drop-in e-ND (electronic ND filter kit)

[Andrew - EOSHD]

Finally someone has done it

https://www.benro.com/en/prelaunch/NE1-nd-filter.html

It has a nifty bluetooth controller with auto-AE as well.

Curious to see how nice it is to use, but no word on pricing yet.

[kye]

Interesting product.  I couldn't see from the images how it is powered, but it looks like maybe it has a USB-C port on top, so maybe it's rechargeable that way.  

I always assumed that such a thing would sit between the camera and lens (like those adapters with drop-in filters) and could be powered by the mount, but obviously this couldn't do that.

If we assume its total range is ND3-64 then that makes it ~1.5-6 stops.  Not a bad range - I use a 1-5 stop vND when out and about and find it has enough range for most run-n-gun conditions.

I gather e-ND filters are much better than vNDs with colour accuracy and not messing with the image too much (e.g. with polarisation etc)?

[eatstoomuchjam]

e-ND filters (at least the ones I've seen) are LCD panels with what is effectively a single very large pixel, so yes, it won't have some of the drawbacks of a vND, especially including no X when dialed up.  I've never noticed any polarization with mine which is the inline filter for the EF mount on Z Cam.  They are also effectively infinitely variable (if someone wants to nitpick that, feel free) so they also make it less important to have a clickless aperture, if you're one of the people who needs stepless exposure pulls on a regular basis.

As for color accuracy, that'd depend on the quality of the LCD panel used, I imagine - but at the very least, I would expect it to stay consistent throughout its range.

I'd also be curious in the future if someone will come out with an electronic ND that allows for gradations or split filtering, etc.  Landscape photographers would be all over it.

[MrSMW]

Interesting at the very least and signed up.