Head and shoulders above the crowd is The Photographers Ephemeris. Odd name, great app. Note:- Maps and elevation-based calculations require a data connection, except for offline map tiles previously downloaded and stored on your device- Topographic map data is available only between 60N and 47S- Availability of map types is subject to change, due to 3rd party map service availability, terms or conditions- The app itself supports only English language at present- Augmented reality requires an iPhone 6s (or later), iPad Pro or 2017 model and iOS 11 or later
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A light meter that is always in your pocket. It is indispensable for film photography with all manual camera. Measures reflected light, and allows reciprocity calculations.