| 摘要 |
<p>PURPOSE:To obtain wide-range photometric performance by performing automatic switching to averaged light measuring mode when a photometric output decrease below a prescribed level on selecting spot light measuring mode by a photometric switching means. CONSTITUTION:With a changeover switch SW4, a spot light measuring side S is selected and when the output Bv(S) of a spot light measuring circuit LM2 exceeds a prescribed level, analog gates AG2 and AG1 turn on and off respectively to charge a storage capacitor C1 by the spot light measuring output. When the spot light measuring output is below the prescribed level, the analog gate AG2 turns off and the AG1 turns on, charging the storage capacitor by the output Bv(A) of an averaged light measuring circuit LM1. When an unaveraged light measuring side A is selected, the gate AG1 turns on and the AG2 turns off all the time, thereby storing the averaged light measuring output.</p> |
