exposure

“Exposure, is the total amount of light allowed to fall on the photographic medium (photographic film or image sensor) during the process of taking a photograph. Exposure is measured in lux seconds, and can be computed from exposure value (EV) and scene luminance over a specified area.
In photographic jargon, an exposure generally refers to a single shutter cycle. For example: a long exposure refers to a single, protracted shutter cycle to capture enough low-intensity light, whereas a multiple exposure involves a series of relatively brief shutter cycles; effectively layering a series of photographs in one image. For the same film speed, the accumulated photometric exposure (H) should be similar in both cases.”
I found this week’s PDP goal rather interesting. I search “exposure, photography” on the google search engine and I came across this link to wikipedia, I was puzzled what Lux was, I first thought it was the shampoo brand that always had advertisements in the media. But the term Lux, is used to measure the speed of light that reaches into the camera sensor. The symbol for Lux is Lx.Okay, I learnt something today.