Try this DIY Neutral Density Filter for Long Exposure Photos
DIY $10 10-Stop Neutral Density (ND) Filter : 7 Steps (with Pictures) - Instructables
Amazon.com: Neewer 37mm Clip-on ND 2-400 Cellphone Camera Lens Filter Kit: Adjustable Neutral Density Filter with Phone Clip for iPhone X 8 plus 7 Plus 7 6 6S Plus Samsung HTC Motorola
GoPro ND Filters and How to Make Them - Drone Nodes
Amazon.com: Neewer 37mm Clip-on ND 2-400 Cellphone Camera Lens Filter Kit: Adjustable Neutral Density Filter with Phone Clip for iPhone X 8 plus 7 Plus 7 6 6S Plus Samsung HTC Motorola
NiSi scales down their filter system for their new Smartphone Filter Kit for iPhone - DIY Photography
Moondog Labs launches a 52mm filter holder for smartphone cameras: Digital Photography Review
Create Your Own Variable Neutral Density Filter
Sandmarc launches hybrid ND/polarization filters for smartphone cameras: Digital Photography Review
New Beastgrip Filters for Smartphone Filmmakers - Fixed ND's, CPL and VND
A new professional filter holder for Samsung S smartphones by Jose Antunes - ProVideo Coalition
Quick Video Tip: Use Sunglasses as an ND Filter for Photo and Video! Plus a Cool Light Leak Effect - YouTube
How To Create a DIY Low-Cost Neutral Density Filter
Inexpensive ND Filter Hack For Your Lenses
NiSi announces new filter kits for iPhone, including ND, polarizer & more: Digital Photography Review
67mm Variable ND Filter Set - Moment
How To Create a DIY Low-Cost Neutral Density Filter
How to Use Your Smartphone as a Graduated Neutral Density Filter
DIY photo filters with everyday objects - CNET
Long Exposure Photography w/ Android Smartphone & ND Filters! - YouTube
A Clip-On ND Filter for Smartphones - YouTube
PolarPro Iris Smartphone ND Filter
GoPro ND Filters and How to Make Them - Drone Nodes
8 Cool DIY Smartphone Photography Tips
