Some while ago, we have a demo video to our Adjustable ND Lens for iPhone and other smartphones:
This Vario ND Lens can use with an iPhone:
As it is a custom made cover, it provides perfect compatibility and much more easy to use.
Of course, if you would like to use with other smartphones, you can use this one instead:
Click here for the Youtube video:
Check the link below for a Ajustable ND lens for your smartphone:
We have more ND lenses for photography use.