The Trygger Camera Case is a polarizing lens filter built specifically for the iPhone 4/4S. The case works in the same way that a DSLR's polarizing filter does, cutting out excess light and glare to create crisper and cleaner photos.
The Trygger Camera Case is simple to use, and slides right onto the back on your iPhone. The case itself is only 1.8mm thick, ensuring that your iPhone will keep its svelte figure with the Camera Case equipped. The filter is adjustable, letting you allow how much light gets in. The project is currently seeking funding on Kickstarter, and has a planned retail price of $49.95. The project is over halfway funded, and has about a month left to go.