Publisher Summary This chapter focuses at what ‘correct’ exposure means and what one should aim for using different films. It discusses equipment for measuring and setting exposure, their different modes of use, and how to avoid mistakes with problem subjects. Films or digital image chips need to receive just the right amount of light to record an image. If insufficient light reaches them they record nothing, or a dark, partial picture. Similarly, too much exposure results in a bleached, washed-out image or just a white blank. “Giving the right exposure” means capturing the correct amount of image light (photons). In practice it is much more than this. Exposure can be used to give emphasis, by deliberately over- or under-exposing parts of the scene such as backgrounds to draw the eye towards the main subject or particular areas and therefore affect composition. Exposure control is also the key to getting fine tonal qualities in the final pictures, whether prints or slides.