Manually set exposure for iOS camera in Swift 4

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How can I set Aperture and how it will effect in image? I have managed ISO and shutter speed.but I am not able to set Aperture value.

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DonMag On BEST ANSWER

The Aperture is a fixed mechanical size and cannot be changed - neither through code nor device settings.

You can get the aperture (the size of the lens diaphragm) via the AVCaptureDevice .lensAperture property, but you cannot change it.

Apple Docs: https://developer.apple.com/documentation/avfoundation/avcapturedevice/1624589-lensaperture