There is no shortage of accessories for the iPhone, especially when it comes to photography. In my iPhone camera bag, I have a Diffcase Lens-Mount Case, a set of the PhotoJojo, a telephoto lens, and even the special effect Jelly Lenses. But missing from my camera bag are filters, like neutral density, polarizers, and color correction.
On the iPhone, much of the work a filter does can be accomplished with apps. I’m not talking about grunge or retro filter effects, but more subtle tweaks to light and color in an image. For example, 645 Pro (App Store) gives you digital color filters and Mattebox (App Store) allows you to control white balance and exposure after you’ve taken the photo. Optical filters, however, alter the light as it enters your lens, and gives you more control to control how that light effects your image before taking the photo. Using filters on an iPhone mean you could take a photo of the moon that isn’t overexposed, minimize reflections off water or glass, or make your images appear cooler or warmer.
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