You must be logged in and verified to contact the designer.
While the 37mm filter holder alone works great for macro lens, for ND filters in direct sunlight, the sun hood really helps get the best image. The sun hood and 37mm filters works fine for all Medium and Narrow fields of view on the GoPro HERO3, HERO3+ & HERO4 cameras. As it is difficult to 3D print fine filter threads, this is just a fiction fit.
Note: This is not an official accessory, use on your GoPro at your own risk.
This product and/or service is not affiliated with, endorsed by or in any way associated with GoPro Inc. or its products and services. GoPro, HERO and their respective logos are trademarks or registered trademarks of GoPro, Inc.