Just saw this. Looks really cool.

HolyManta internal ND lens Adapters | FundedByMe - Fund your project through social networks (http://fundedbyme.com/projects/1740/holymanta-internal-nd-lens-adapters/)

FS100, EA50 and any other E-mount shooters won't have to mess with screw on filters or matteboxes. I''ll try one if it doesn't cost more than $500. Thanks for sharing.

$280 normally, but $200 if you get in on the crowd funding.

I have m43, but more Minolta & Nikon lenses than EF, so I'm on the fence. If I had an arsenal of EF glass I'd be all over this.

Awesome idea and much needed piece of equipment! He'll do very well with this product!