Mar 3, 2005


Fred Parker has a and article he describes as-
The introduction states-
Imagine an exposure computer so advanced that it uses your eyes as a sensor. The processing unit is as powerful as your brain. The computer is accurate over a light range from reflected starlight through the light produced in a hydrogen fusion reaction. This computer weighs nothing and operates without batteries. It comes with instructions to allow you to implant the capabilities of the computer directly into your own memory so you can accurately judge a correct exposure by simply looking at the type of light that the subject is in. You are using this computer right now!

Everything I've said above is true. However, I'm sure you've noticed that the only thing before your eyes is a World Wide Web page. An entire photographic industry has been built by convincing consumers that the subject of photographic exposure is so arcane, difficult and impossible to understand, that it is best left up to technology. This, of course, allows companies to sell billions of dollars worth of equipment to figure it all out for you....

A good read, and some very good rules of thumb to know and follow. For example-
  • If your shutter speed is slower than the reciprocal of the focal length of your lens, you must use a tripod.

  • On a bright, sunny day, the correct exposure for any subject is f/16 at the shutter speed nearest to the reciprocal of the film speed.

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