Zeiss S100/OPMI pico, Instructions For Use Manual

Page: 143 / 278

Version 7.0
G-30-1781-en
Page 143
S100 / OPMI pico Operation
Lightmeter sub menu
In the "LIGHTMETER" sub menu, you can select between three different types
of exposure measurements: INTEGRAL, SMALL SPOT or LARGE SPOT.
The Lightmeter function is only enabled if Brightness is set to the AUTO-
MATIC" or "LOW LIGHT AUTO" mode.
INTEGRAL:
The exposure is measured and averaged across the full video image. This
measurement is recommended for surgical fields that are fully and evenly lit.
LARGE SPOT:
The exposure is measured in an area in the image center. This measurement
is ideal for working with an eclipsed surgical field edge (resulting from a re-
duced illuminated field diameter).
SMALL SPOT: The exposure is measured in a very small area in the image center. This meas-
urement is suitable for work in narrow channels when an extremely small illu-
minated field diameter is being used.
However, if the object of interest is not located in the image center, the
SMALL SPOT setting usually does not provide the desired exposure result. In
this case, select either a larger area (INTEGRAL or LARGE SPOT) or use the
manual exposure mode.
Fig. 71: Types of
exposure measurement
INTEGRAL
LARGE SPOT
SMALL SPOT