If we assume you have the correct exposure setting for a given scene, and you wish to change the aperture, you must also make a change to the shutter speed or ISO to compensate for the increase or loss of light.

ENGADGET: Primed: What is aperture, and how does it affect my photos?

The notion that Africa's emerging middle classes need more exposure and more encouragement is entirely correct.

BBC: Back to whose reality?

"It was at the beginning of the year that portfolio managers started scaling back their exposure to heath care, and they were correct to do so, because when the April results came any company related to the pharmaceutical market had to lower their estimates because of reform, " Novarro says.

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