AAton XTR User Manual - 2.9 Lightmeter

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.

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