A Lens of Focal Length $45 \mathrm {~mm}$ Is Mounted on A

question 120

Multiple Choice

A lens of focal length $45 \mathrm {~mm}$ is mounted on a $35 - \mathrm { mm }$ camera. The lens aperture is set at $f / 2.0$ and the shutter speed set at $1 / 2000 \mathrm {~s}$ . The photographer wants to keep the same exposure (amount of light) , but wants to change the $f$ -number to $f / 8.0$ for greater depth of field. What should be the new shutter speed to maintain the same exposure?

• A) \(1 / 8000 \mathrm {~s}\)
• B) \(1 / 1000 \mathrm {~s}\)
• C) \(1 / 4000 \mathrm {~s}\)
• D) \(1 / 125 \mathrm {~s}\)
• E) \(1 / 500 \mathrm {~s}\)

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Definitions:

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