This is a great post that I had to reblog. It’s on the technique on shooting “long exposure”. Hope it helps folks.

Let me hit you with some knowledge.

Long exposure is another way of saying “keeping the shutter open for a long time”. This can be done for a few reasons – to compensate for low available light, as one of a many exposures for bracketing, or to capture the idea of motion on film…errr….sensor. Let’s look at all of these briefly, shall we?

Most DSLR cameras give us the ability to control how much light hits the camera’s sensor. We can do this by adjusting the aperture (size of the opening through which the light travels), or time value/length of exposure (the length of time the aforementioned opening stays open). The aperture size and length of time the shutter remains open will help determine the overall exposure of the image captured.

For example, this image was taken with an f/1.8, 50mm lens. The only available light was a street lamp…

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