# FlashPower+ — Flash & Field Depth Calculator > Camera flash and depth of field calculator for photographers. (iPhone/iPad app by Anthony McInvale.) - Source: https://appshunter.io/ios/app/flashpower-plus/id976263067 (this page in markdown: same URL + `.md`) - Developer: [Anthony McInvale](https://appshunter.io/developer/976263066) - Category: Photo & Video, Utilities - Price: $4.99 - Rating: 3.40/5 from 5 App Store ratings · 1 written reviews indexed - Age rating: 4+ - Requires: iOS 9.0 · 16 MB - Languages: American English - Released: 2015-03-25 - Data updated: 2026-06-10 - Monetization: paid - User reviews in markdown: https://appshunter.io/ios/app/flashpower-plus/id976263067/reviews.md ## What is FlashPower+? The Flash Power iPhone App is combination camera flash calculator and depth of field calculator. Based on guide numbers provided by the manufacture of a flash unit, the calculator will determine either the maximum flash distance for a given aperture or the necessary aperture for a desired subject distance. The guide numbers given out by a flash vendor are normally based on a rating for the flash using an ISO of 100 and the distance in meters. The calculator will perform the conversion to use other ISO stops. The distance given will automatically be converted from meters to feet in the calculator. Version 2.0 added an option to select the power setting on the flash calculator. The selections include Full, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64 and 1/128. Using the inverse square law, the calculator will provide the flash drop off distances for 25%, 50% and 75% of power setting. The depth of field calculator includes a large selection of camera manufacturers and models. This list is used to provide the basis of the depth of field calculation. If your camera is not listed, you will be able to add the manufacturer and model. The "Circle of Confusion" value must be provided for the depth of field to be calculated. ## Key features - Camera flash distance calculator - Depth of field calculator - Supports various flash power settings - Custom camera model input - Converts meters to feet - Adjusts for different ISO settings ## Recent user reviews (1 of 1) All indexed reviews: https://appshunter.io/ios/app/flashpower-plus/id976263067/reviews.md ### 1/5 — Useless *2020-01-05, version 2.5* Does calculate aperture and distance (which are usually a given), but does not calculate the flash power, which needs to be set. ## Frequently asked questions about FlashPower+ ### What is FlashPower+ used for? FlashPower+ is a dual-purpose calculator for photographers. It helps determine camera flash distances based on guide numbers and aperture, and also calculates the depth of field for specific camera models and settings. ### How does the flash calculator in FlashPower+ work? The flash calculator uses the guide numbers provided by your flash unit to calculate either the maximum flash distance for a given aperture or the necessary aperture for a desired subject distance. It also converts distances from meters to feet and can adjust for different ISO settings. ### Can I adjust the power setting on the flash calculator in FlashPower+? Yes, version 2.0 of FlashPower+ added an option to select the power setting on the flash calculator. You can choose from Full, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, and 1/128 power settings. ### How is the depth of field calculated in FlashPower+? The depth of field calculator includes a wide selection of camera manufacturers and models. To perform the calculation, you will need to provide the 'Circle of Confusion' value for your camera. If your camera isn't listed, you can add it manually. ### What devices is FlashPower+ compatible with? FlashPower+ is designed for iPhone and iPod devices. It is rated for ages 4 and up. ### How much does FlashPower+ cost? FlashPower+ is a paid application, available for $4.99. There are no in-app purchases or advertisements mentioned. ### When was FlashPower+ last updated? The latest version of FlashPower+ is 2.5, which was last updated on October 2, 2017. The app was initially released on March 25, 2015. ### What is the user rating for FlashPower+? FlashPower+ has a rating of 3.4 stars based on 5 user ratings. This indicates a mixed reception from its user base. ## Version history (last 5 releases) ### 2.5 — 2017-10-02 This app has been updated by Apple to display the Apple Watch app icon. Potential crash fix. The app will prompt for a review. Please use the support web page if you have issues or questions. If you find value with the app, please provide a review. ### 2.4 — 2017-09-26 Recompiled with the new Swift compiler. The app will now prompt for a review. Please contact me at the support web page if you have issues or questions. If you find value with the app, please provide a review. ### 2.3 — 2017-09-22 Please rate this app in the Apple Store when you find this calculator useful. If you have suggestions or concerns, please email those to my email address on the support site. I am looking for ways to improve the app! Version 2.3 updates list to include new cameras released by manufacturers since the last version. Fixed default values for fields and buttons. Fixed keypad to not cover distance field on smaller iPhones. ### 2.2 — 2016-10-11 Rate this app in the Apple Store when you find this calculator useful and valuable. If you have suggestions or concerns, please email those to my email address on the support site. I am looking for ways to improve the app! Version 2.2 Fixed issue with app crashing on loading. ### 2.1 — 2016-09-27 Version 2.1 compiled with Xcode 8. Fixed issue. Version 2.0 adds an option to select the power setting on the flash calculator. The selections include Full, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64 and 1/128. Using the inverse square law, the calculator will provide the flash drop off distances for 25%, 50% and 75% of power setting. This version also adds a depth of field calculator. The calculator includes a large selection of camera manufacturers and models. This list is used to provide the basis of the depth of field calculation. If your camera is not listed, you will be able to add the manufacturer and model. The "Circle of Confusion" value must be provided for the depth of field to be calculated. Rate this app in the Apple Store when you find this calculator useful and valuable. If you have suggestions or concerns, please email those to my email address. 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Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*