Correcting device for cameras with automatic exposure control

Claim 1

In a camera of the type having a variable impedance, the value of which constitutes one of the inputs of an exposure control circuit, a manually operated operating ring 8 for altering the value of said variable impedance, and a film sensitivity indicating ring 20 rotatably fixed to said operating ring to rotate therewith, the improvement comprising, a. a first exposure correction indicating ring 19, b. a second exposure correction indicating ring 7, c. first interlocking means (18 and 8) for rotatably interlocking said operating ring and said first exposure correction indicating ring, said first interlocking means being manually disengagable to permit said operating ring to be rotated independently of said first exposure correction indicating ring, d. second interlocking means (16 and 18) for rotatably interlocking said first and second exposure correction indicating rings, said second interlocking means being manually disengagable to permit said first exposure correction indicating ring to be rotated independently of said second exposure correction indicating ring, and e. third manually disengagable locking means (9, 10, and 11) for preventing rotation of said second exposure correction indicating ring, whereby selective operation of said manually controlled interlocking means plus rotation of said operating ring causes selective rotation of one, two and three of said indicating rings.