AstroExposure

Astro Exposure Calculator

Free · In‑App Purchases · Designed for iPad. Not verified for macOS.

AstroExposure helps you quickly calculate the ideal exposure time for photographing stars without trailing, using the 500 rule (for beginners) or the NPF rule. AstroExposure is a simple, precise calculator for planning your night sky photography. Choose your calculation method, enter your focal length, aperture, and sensor specifications, and instantly get a recommended exposure time to minimize star trailing. The app supports the most widely used astrophotography rules, including the 500 Rule and the NPF Rule. You can also select a camera from the built-in database, adjust settings manually, and save your favorite configurations. Key features: • Astrophotography exposure time calculation • 500 Rule and NPF Rule support • Sensor or camera selection • Focal length, aperture, and pixel size settings • Favorites for quick access to your settings • Clean, fast, and distraction-free interface AstroExposure is designed for photographers who want to spend less time calculating and more time under the stars.

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The developer, Piriou Alain, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • Piriou Alain
    Size
    • 6 MB
    Category
    • Photo & Video
    Compatibility
    Requires iOS 17.6 or later.
    • iPhone
      Requires iOS 17.6 or later.
    • iPad
      Requires iPadOS 17.6 or later.
    • Mac
      Requires macOS 14.6 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.3 or later.
    Languages
    English and 7 more
    • English, French, German, Italian, Japanese, Simplified Chinese, Spanish, Traditional Chinese
    Age Rating
    4+
    In-App Purchases
    Yes
    • Coffee thermos under the stars 🫖 $3.99
    • Latte under the stars ☕️🥛 $2.99
    • Espresso under the stars ☕️ $0.99
    • Learn More
    Copyright
    • © 2026 Alain Piriou
  • Privacy Policy

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