Development of The 35 Mm SLR
The first 35mm prototype SLR was the Soviet Union's Спорт (“Sport”). Prototyped in 1934, it was a very smart design with a 24mm × 36mm frame size, but did not enter the market until 1937. Therefore, it cannot be claimed as the first 35mm SLR.
Read more about this topic: History Of The Single-lens Reflex Camera
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