Provided are a digital camera supporting an intelligent self-timer, which pauses an image capturing operation when an unwanted subject enters a subject composition and starts the image capturing operation later, and a method of controlling the digital camera. In particular, reflection photomasks include a substrate and a reflection layer having multiple sets of alternating films of first and second materials, on the substrate. The photodetector generates an output signal proportional to the amplitude of an arterial pulse, and an electronic circuit connected to the photodetector generates a signal having a frequency proportional to the photodetector output signal level. The fixed plate and the movable plate define a passage therebetween.