Grass Valley TTV 1657D - Manuel (Page 174)

174 Chapter 4 - Lens
Description of lens controls
B1657D902C
Septembre 2000
THOMSON TTV 1657D
User manual
1 - Zoom electrical remote control connector
The electrical control has no effect in the zoom manual mode - see zoom control mode.
2 - Zoom electrical control - (active in zoom SERVO mode)
W: wide angle - T: tele-lens
The field angle variation rate depends on the pressure applied to this control.
3 - "MOM. IRIS AUTO" switch (Iris automatic - momentary mode)
When this button is pressed, the lens aperture is slaved to subject illumination.
4 - "AUTO/MAN" switch
- AUTO: Aperture automatically adjusted according to subject illumination.
- MAN: Automatic adjustment of lens aperture using the Iris ring.
Even in the MAN position, the Iris aperture is set to AUTO during the operational
automatic adjustments:
-white automatic balance: the Iris opens to obtain a more or less nominal video level
at the output from the camera,
-black automatic balance: the Iris closes. The Iris remains closed after adjustment if
the switch is set to MAN.
5 - Zoom control mode
Pulled-out position: MANUAL mode. The zoom is controlled by the zoom ring.
Pushed-in position: SERVO mode. The zoom control is made by the electrical control on
the lens and/or zoom electrical remote control.
6 - Grip
7 - "RET" button - to control display of return video on the viewfinder screen.
This video may be:
- in the ENG mode, the video recorder playback video,
- in the EFP or studio mode, the return control room video.
8 - "VTR" button
This control is connected in parallel with the camera "VTR" button.
- In the ENG mode (video recorder on camera or remoted with a CA25): press this
button to start recording. Press the button again to end recording.
- In EFP CA85 mode: this button permits the cameraman to switch the CAM audio
link to PROD if the "ENG REMOTE PROD" selector switch on the back of the CA85
is set to "REMOTE".
- In the EFP CA25 mode: this button permits the cameraman to call the producer or
technician.