Lens Slate is a free photography app for iOS and Android to help you keep track of the configuration of manual lenses as you shoot.
When you use a digital lens on a digital camera body, information about the lens model, focal length, and focal ratio is typically recorded in the image file.
When you use a manual lens, this information is not recorded. Later, you might remember which manual lens you used for a particular photograph, but you often won't remember the focal ratio or, for zooms, the focal length.
Lens Slate helps you keep track of this information.
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