Pentax PZ-1p PZ-1p Manual - Page 46

\\N About Memory Lock The memory lock function enables an exposure level to be memorized before shooting. The memory lock function is very effective when used along with spot metering. Use the memory lock function to get a correct exposure when the subject occupies only a small part of the viewfinder. Position the area to be measured fully in the spot metering area and press the memory lock button MLi * As soon as the memory lock button [ML] is pressed, a 10 second timer starts and the camera stores the measured exposure level until the time expires. * If the shutter release button is depressed halfway down while the memory lock timer is operating, the memorized meter reading will be remained even if the memory lock button is released. * By using the Pentax function, you can set the exposure level so that it is locked after the autofocus operates. Set the focus mode switch to [SINGLE:, and depress the ML button. * The audible PCV signals can be heard when the memory lock button [MLil is depressed. This function can be canceled by the Pentax function No.1. * During memory lock operation, * is displayed in the viewfinder. * To cancel memory lock, depress the memory lock button L-ML.j again while the memory is locked.