\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.
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Nikon's new power zoom lens is made for videoNikon has announced the Nikkor 28-135mm F4 PZ, a lens geared toward professional video shooters, and the company's first full-frame power zoom lens. It's the latest result of Nikon's increased ...
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