Bythisapp,youcanuseyourphoneasincidentlightmeter,andyoucantakeapictureofthecorrectexposure.
Thisappcanmeasure'Fnumber','Shutterspeed'or'ISOsensitivity'.
SetthesemeasurementvaluesatyourDSLRcamera.
Theaccuracyofthemeasurementvaluedependsonilluminancesensoronyoursmartphone.