Restarting my iPhone 12 Pro also worked for me
artoonie
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Some additional info:
I can get a 1-second exposure using the following code snippet:
[myCaptureSession setSessionPreset: AVCaptureSessionPresetHigh];
[myCaptureDevice setExposureMode:AVCaptureExposureModeCustom];
[myCaptureDevice setExposureModeCustomWithDuration:[myCaptureDevice activeFormat].maxExposureDuration
ISO:[myCaptureDevice activeFormat].maxISO
completionHandler:nil];
The following snippet should allow up to 1 second exposure -- but it does not.
[myCaptureSession setSessionPreset: AVCaptureSessionPresetHigh];
[myCaptureDevice setExposureMode:AVCaptureExposureModeContinuousAutoExposure];
[myCaptureDevice setActiveMaxExposureDuration:[self.captureDevice activeFormat].maxExposureDuration];
[myCaptureDevice setExposureTargetBias:1 completionHandler:nil];
It seems that AVCaptureExposureModeContinuousAutoExposure tries to force you to do something sane, which is limiting the exposure duration to 1/30s. I have confirmed with exposureTargetOffset that the exposure level is far below its target. How can I force iOS to use longer exposures without implementing my own autoexposure algorithm?