Flex - May 1959 (The top-class 35mm camera market gradually shifted from rangefinder cameras to single-lens reflex cameras. The major reason was that SLRs could handle close-ups, photomicrography, duplication work, and other applications without being constrained by the limits of rangefinder camera lenses. When Canon introduced the Canonflex, its first SLR, there were already eight SLR models on the market)
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