the situation—where to be, and when
the camera and lens—whether to view a wide or narrow angle, with or without filters that adjust the color balance or image
the film—whether to use black and white or color film, slide, print or digital film, and the sensitivity of the film to low light (ASA rating)
the settings—the effects of the lens opening (f-stop) and exposure time (shutter speed) on the sharpness and clarity of the image
the shot—where to aim, what to focus on, and when to click the shutter