Camera Exposure Profiling; Calibration Testing For Exposure Profiling - Sekonic L-758 Operating Manual

7. Camera Exposure Profiling

1.

Calibration testing for exposure profiling

Since no two digital cameras, camera and light meter or different types of film are likely to agree on
the same exposure, they need to be calibrated. The L-758DR (L-758D/L-758CINE) can be pro-
grammed to match the sensitivity of film or digital camera sensor for prefect exposure control. In
addition, since film and digital cameras have their own unique dynamic range, clipping point (expo-
sure tolerance) and varying ISO sensitivity they need to be profiled. To ensure repeatable accurate
and consistent measurements and to be aware of the tonal or dynamic range of a particular type of
film or digital camera before making a photograph, the L-758DR/L-758D/L-758CINE can be
programmed to stored, recall and display up to three different digital cameras or film types.
Below are the following settings that can be programmed into the L-758DR/L-758D/L-758CINE.
1. Compensation value
Compensation value (aperture and shutter speed) can be programmed for a specific camera
and hand-held meter. Compensation adjustment is within a +/- 5EV range in 1/10 step incre-
ments.
2. Clipping point (-)
The point at which a given lighting situation (pre-exposure) has surpassed the responds level of
a sensor or film and alerts the shooter of a under exposure situation (Pre-Exposure Warning).
These point can be custom set from -7EV to 0EV in 1/10 increments.
3. Dynamic range (-)
The point at which the sensor or film has reached its maximum reproducible shadow details
without pixel noise or grain. Dynamic range (-) adjustment is set from -7EV to 0EV in 1/10 step
increments.
4. Dynamic range (+)
The point at which the sensor or film has reached its maximum reproducible highlight details
without blooming or highlight block up. Dynamic range (+) adjustment is set from 0EV to +7EV
in 1/10 step increments.
5. Clipping point (+)
The point at which a given lighting situation (pre-exposure) has surpassed the responds level of
a sensor or film and alerts the shooter of an over exposure situation (Pre-Exposure Warning).
These point can be custom set from 0EV to +7EV in 1/10 increments.
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