Post #271172 by MobileTikiBar on Thu, Dec 7, 2006 8:41 PM

On 2006-12-07 10:26, Digitiki wrote:
Mobile,
Your Vegas pix are great! Forgive me for sounding like a total novice, but the F speed, the lower the number the smaller tha apeture-is that right?

MARK

Opposite actually. The higher the f-stop number, the less light that comes in, meaning the smaller the aperture.

So a properly exposed photo taken at:
ISO 100 (speed of film or sensor)
F5.6 (size of aperature, bigger number = smaller hole)
1/500 second (amount of time light permitted through the camera)

Would also be properly exposed at:
ISO 100
F8
1/250 second
The aperature change from f5.6 to f8 means 1/2 as much light gets in. The shutter speed change from 1/500 of a second to 1/250 of a second means twice as much light gets in.

-a