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\(power \ of \ a \ lens \ (D) = \frac{1}{focal \ length \ (m)}\) A lens has a power of -3.33 dioptres. Calculate the focal length and state what type of lens it is.
Setting a new benchmark in focal length reach for the Sony mirrorless system, the new lens announced is a 400-800mm F6.3-8 G OSS that can reach a staggering 1600mm with a 2x converter.
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