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FEATURED WEB TUTORIAL: APERTURE
 

What's Up With... F-Stops?

Published by:  Popular Photography
Tutorial Preview:

Remember taking your SATs? They had questions like this:

What is the next number in this sequence: 1, 1.4, 2, 2.8, 4, 5.6...?

At this point, you'd fill in the circle for "8" (or should have). Each number doubles by leapfrog. And so the next number after 8 should be 11.2. But let's simplify things and round it off to 11.

This is the f-number sequence. Math-wise, it's a geometric progression on the square root of 2 (1.414....).

OK, why such weird numbers?

ADDITIONAL WEB TUTORIALS: APERTURE
 
Understanding Aperture by Cameratown
In the dictionary the term Aperture has this definition: "a usually adjustable opening in an optical instrument, such as a camera or telescope,
Learn to use Aperture by About.com
The aperture is the hole through which light enters the camera, also called the iris. Apertures are measured using a relative scale, and designated
Aperture Explained - Video by BestPhotoLessons.com
Depth of Field Video Tutorial by Pospisil
This video tutorial provides the user with example of smaller and larger apertures, the effects, and when and why you would want to control
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