EV (ex­po­sure value)

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The scale used to de­note the ex­po­sure re­quired with­out the need to spec­ify ei­ther shut­ter speed or aper­ture. A par­tic­u­lar EV set­ting has its own set pairs of pos­si­ble shut­ter speed and aper­ture. Ex­po­sure val­ues are of­ten quoted in com­bi­na­tion with an ISO speed to de­note a spe­cific light level.

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