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What is Pentax 6x7 Lens Production Estimates about?

This document provides lens production estimates for various SMC Pentax 6x7 lenses between certain serial number ranges from 1982 to 2019. It lists six different lenses - a 500mm f/5.6, 75mm shift f/4.5, 55mm f/4, 45mm f/4, 90mm f/2.8, and 165mm f/2.8 lens - along with their automatic or manual function, focal length, maximum aperture, serial number range produced, and estimated production quantity.

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api-263686066

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