AAton XTRprod, User Manual

Page: 34 / 109

sory connectors, provide the capability of using a remote on/off with
either a half-frame or full-frame inching function.
2.9 LIGHTMETER
The XTRprod is equipped with an internal lightmeter that is desi-
gned to read the quantity of light reflected off the film itself. For ad-
ded accuracy, the meter measures the light by means of two photo-
cells. The metering system automatically compensates for filters and
changes in camera speed.
2.9.1 Display
Through the viewfinder, the lightmeter display is positioned directly
below the viewing screen across the bottom of the frame. A single
darkened diode moves across an array of 13 yellow and green diodes,
indicating proper exposure (see diagrams). Each diode represents
one third of a stop, while normal exposure darkens the center green
diode. Underexposure of -2 stops or more darkens the green diode
on the left end of the row; overexposure of +2 stops or more darkens
the green diode on the furthest right of the display.
To the immediate left of the display is the red diode indicator, whi-
ch has the same functions as the red diodes on the left and right
sides of the body. See section LED Indicators for further details.
2.9.2 Operation
Because the lightmeter takes its measurement as a reflection off the
film, you must have film in the gate for the camera to provide an ac-
curate reading.
To use the lightmeter, follow these simple guidelines: Set the ISO se-
lection on the control panel to the exposure index of the film stock
being used. Set the camera to run or test position and adjust the lens
iris until the center green diode is darkened; this will be your proper
metered exposure.
34