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Light Meter and DOF


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#1 Ian Jackson

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Posted 27 July 2007 - 04:27 PM

Hi,

A question i have always wondered.... say for example i go to shoot a scene on film and take a light meter reading and for example the light meter says to set me shutter speed 1/350 and the apeture at 5.6 giving me a shallow DOF, what is the rule about adjust the iris.... say to 11? what would i have to set the shutter speed at?

Thanks!!
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#2 Michael Nash

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Posted 27 July 2007 - 05:27 PM

This is a very basic question that is covered in any introductory photography book. You'll probably learn much more by reading a few of these, and then post follow-up or clarification questions here instead.

An increase of one f-stop reduces the amount of light in half. Doubling the shutterspeed doubles the amount of light.
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#3 e gustavo petersen

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Posted 27 July 2007 - 05:29 PM

1/350 is a bit of an odd shutter - I've never know a camera to have that. (Perhaps you meant 1/250) Assuming you did:

1/250 @ ?5.6
1/125 @ ?8
1/60 @ ?11

Each step down in your shutter speed is a step (or stop) up on your iris.
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