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4 Other Functions and Options
4-1 Checking for Low
Power
The power low LED, used to indicate low power supply
warning, is provided on the indicator panel at the left side of
the lens, as viewed from the camera.
According to the supplied voltage, LED indicates:
Lit red:
10V or less
Off:
Supplies sufficient voltage
So, when the LED is lit red, countermeasures to raise the
supply voltage to 10.5V or above is necessary. Otherwise,
the lens may malfunction.
The value indicated by the indicator varies
depending on the model.
4-2 Using an External
Power Source
An external power input jack is provided at the right
side of the lens, as viewed from the camera. In case the
combination of portable camera and the lens with semi
or full servo operation, 12V DC (10-17V DC) should be
supplied to the lens through this jack since portable camera
does not have enough power consumption to drive semi or
full servo operation.
External Power Input Jack
POWER LOW LED
NOTE
If a battery or adapter is used, the output voltage may be higher than
the rated voltage depending on the manufacturers and therefore the
following voltages must be observed strictly. If a voltage outside the
normal operation range is used, the product may be damaged.
Rated voltage: 12 VDC
Normal operation range: 10 to 17 VDC
And the lens power input has the positive and negative polarities. Make
sure to connect the power cable to the correct polarity when connecting
the batteries or the adaptors. Connecting the cable to the incorrect
polarity may cause the damage to the product.
4-3 Heater System
The heater system for warming up the lens to prevent
clouding inside the lens can be mounted on the lens. The
heater system is operated as follows.
1
Set the heater ON/OFF switch, which is located on the
right side of the lens as seen from the camera, to the
ON position.
2
To shut down the heater, set the heater ON/OFF
switch to the OFF position.
Heater ON/OFF Switch
NOTE
A great deal of power is consumed when the heater switch is ON.
For this reason, the circuitry is designed to disable servo zoom
operations and servo focus operations.
To perform servo operations, stop using the heater.
4-4 Dry Air Filling
To prevent fog or condensation on the internal surface of the
lens, you can fill the lens barrel with dry air.
Dry air should be refilled at the periodic overhaul, and before
the critical event.
NOTE
To refill dry air, gas canister and filling tool are required. Contact
your Canon dealer or your Canon sales representative.
E19
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