ShutterMeter uses the iPhone microphone to analyze mechanical shutter sounds and estimate the interval between opening and closing. Compare repeated results with the selected speed and keep a record for each camera.
Support / 支持： Send questions and bug reports to szpwqq@gmail.com. Include your iPhone and camera models, app version and the shutter speed you were testing. 反馈时请附 iPhone 型号、相机型号、App 版本和测试档位。
Guided three-reading tests help you repeat a speed before moving on. The shutter health map uses the latest three Clear signal results at each speed to show median deviation, spread and tested-speed coverage. You can share a text report, browse camera histories and review exposure compensation guidance. The colorful interface supports Dark Mode, Dynamic Type and VoiceOver.
View ShutterMeter on the App Store. The store page shows the version currently available in your region.
Microphone mode supports 11 nominal speeds from 1 second to 1/60 second, including 1/5, 1/10, 1/25 and 1/50. Camera mode is not enabled; 1/100 and faster speeds are not supported in this version. Clear signal describes the recording quality, not certified accuracy. ShutterMeter has not completed accuracy validation across all speeds against a physical shutter tester. Mirror slap, background noise and shutter design may prevent a usable result.
Use an unloaded camera in a quiet setting. Open the camera back or remove the lens to expose the shutter sound, hold the microphone about 2 to 5 cm away, start a measurement and fire once. Keep still until the result appears. Repeat a speed three times; treat scattered results as a reason to check the setup and retest.
Audio is analyzed on your iPhone. The app does not automatically upload measurement data. Reports go to another app only when you choose to share them; device backups may include saved records. Apple processes purchases. The first 10 measurements that produce a result are free, and a one-time purchase unlocks unlimited measurements. Local camera records remain available to view. See the privacy policy.
快门测速仪通过 iPhone 麦克风分析机械快门开合的声音，估算间隔时长，帮助你比较标称档位并记录每台相机的变化。1.1 新增同档三连测、快门健康地图与文字报告分享；商店当前可用版本以 App Store 显示为准。
麦克风模式支持 1 秒至 1/60 秒的 11 个标称档位，包括 1/5、1/10、1/25、1/50 等老标尺。摄像头模式尚未开放，1/100 及更快档位不支持测量。
在安静环境中使用未装胶卷的相机，打开后盖或取下镜头，让快门声音直接暴露。手机麦克风距快门约 2 至 5 厘米，开始测量后只按一次快门，等结果出现再移动。同档连续测三次，确认结果接近后再作为拍摄参考；反光镜拍击、噪声或快门结构可能影响判断。
“信号清晰”描述录音质量，不表示精度认证。本工具尚未完成实体快门测速仪全档对标，健康报告是诊断参考，不替代实体校准。并非每一种机械快门都能得到可用结果。
录音在本机分析，App 不会自动上传测量数据；主动分享的报告会交给你选择的应用，设备备份可能包含保存的记录。前 10 次产出结果的测量免费，未识别出结果的尝试不扣次数；一次买断解锁不限次数测量，本地相机记录始终可查看。购买和恢复购买由 App Store 处理。详见隐私政策。