If you are experiencing issues with the latest version of Exposure Time Calculation due to bugs or incompatibility with your device, downloading an older version can be a practical solution before the app developer fixes the problem. APKPure offers all of the older versions of Exposure Time Calculation that are compatible with various devices and Android systems. Download rollbacks of Exposure Time Calculation for Android. All downloads from APKPure are free from viruses and provide a fast, secure way to get the app version history you need.