Topcon R

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The Topcon R is a 35mm SLR from Tōkyō Kōgaku which appeared in 1958.[1] It is notable as an early Japanese SLR incorporating an instant-return mirror (following on from the Asahiflex). In addition to adopting the Exakta lens mount, it follows in offering a pentaprism which is detachable and exchangeable with a waist-level viewfinder hood. Likewise, the supplied 58mm f/1.8 Auto-Topcor uses a pressure activated diaphragm but with semi-automatic action (it is manually reopened with a lever atop the lens). Alternately the purchaser could choose an Auto-Topcor 35mm f/2.8 at the same cost.

Enlarger-manufacturer Beseler also began offering this camera under its own badging as the Beseler B Topcon.[2]


  1. It is advertised and noted as new in the October, 1958, Modern Photography magazine (Vol. 22, No. 10).
  2. It is advertised in the April, 1959, Popular Photography (Vol. 44, No. 4).


The Topcon R manual and Beseler B Topcon manual are posted at Mike Butkus's