JVC GY-DV500E Instruction Manual - Page 42

13. FEATURES OF THE CAMERA SECTION 13-3 Shooting the Screen Image on a Computer Monitor Video monitor Band FILTER 1 3200k 2 5600k 3 5600k+ND SHUTTER STATUS MENU ALARM MONITOR AUTO IRIS FULL AUTO BLACK BACK L NORMAL SPOT L STRETCH NORMAL COMPRESS LOLUX PRST A B ON KNEE OFF AUTO BARS CAM HML SAVE STBY VTR GAIN OUTPUT WHT.BAL NG POWER ON OFF SHUTTER dial OPERATE/WARNING RESET MONITOR SELECT CH-1 AUDIO CH-2 LEVEL LIGHT ON OFF COUNTER CTL TC UB - - - OPERAT I ON - - - SCENE F I LE A SHUT TER : VAR I ABL E F AW : NONE GA I N L : 0dB GA I N M : 9dB GA I N H : 18dB SMOOTH TRANS : OFF PAGE BACK Outline The following operation allows the alignment of the shutter speed of the camera with the variable scanning rate of a computer monitor or display. When a computer monitor screen or display is shot with the camera, a bright horizontal line indicating excessive exposure is displayed in cases when the scanning rate of the monitor is faster than the shutter speed of the camera. A dark horizontal line indicating insufficient exposure is displayed in cases when the monitor's scanning rate is slower than the camera's shutter speed. The scanning frequency of a monitor varies due to various reasons during the computer operation. Adjust the scanning rate to obtain a stable image while observing the image in the viewfinder. Variable Scan [V.SCAN] • Basic operation Set the SHUTTER item on the OPERATION MENU screen to VARIABLE. Then move the SHUTTER knob upwards or downwards to change the shutter speed. (The speed is displayed on the viewfinder screen.) • Compatible frequencies The variable scan function is compatible with scanning frequencies in the following range. 60.1 to 2084.6 Hz (U-ver.) 50.1 to 2067.8 Hz (E-ver.) CAUTION: This function is not compatible with slow-speed computer monitors with a vertical scanning speed of 60 Hz (U-ver.)/ 50 Hz (E-ver.). OPERATION MENU screen 81 13. FEATURES OF THE CAMERA SECTION 13-4 Gain (Sensitivity) Adjustment The gain should be switched when the brightness is insufficient due to poor lighting conditions. GAIN SWITCHING GAIN switch AUTO IRIS FULL AUTO BLACK BACK L NORMAL SPOT L STRETCH NORMAL COMPRESS LOLUX PRST A B ON KNEE OFF AUTO BARS CAM HML SAVE STBY VTR GAIN OUTPUT WHT.BAL NG POWER ON OFF CAUTION: When gain is set to "ALC", gain is boosted automatically as the illumination becomes darker. However, noise will increase a little because the screen becomes brighter as the ALC (Auto Level Control) function boosts the gain more than in the case of manual adjustment. This switch allows the gain to be boosted when the illumination of the subject is insufficient. Switch Position L M H Factory-Set Gain 0dB 9dB 18dB When the GAIN switch is switched, the newly set gain is displayed for about 2 seconds on the Status 0 or Status 1 screen in the viewfinder. Set it to L (0 dB) in normal use. The gain set for each of the switch positions can be changed with "GAIN" on the OPERATION MENU screen. It is also possible to use the ALC function that varies the gain automatically. See page 73 for details. To make the gain transition smoother, set "SMOOTH TRANS" on the OPERATION MENU to "ON". See page 73. However, note that the SMOOTH TRANS function is not available if gain is set to ALC. GAIN BOOST UNDER LOLUX CONDITION LOLUX on/off button AUTO IRIS FULL AUTO BLACK BACK L NORMAL SPOT L STRETCH NORMAL COMPRESS LOLUX PRST A B ON KNEE OFF AUTO BARS CAM HML SAVE STBY VTR GAIN OUTPUT WHT.BAL NG POWER ON OFF The LOLUX button is used when the illumination is still insufficient after compensating with the GAIN switch. Press the button to enter the LOLUX mode in which the gain is boosted by about 33 dB. "LOLUX ON" is displayed for about 2 seconds on the Status 0 or Status 1 mode screen in the viewfinder. Pressing the button again cancels the LOLUX mode. "LOLUX OFF" is displayed for about 2 seconds. When the LOLUX function is in use, the image definition on the screen will degrade to increase residual images, but this is not a malfunction. [Relationship between gain, iris and shutter] 0.7 Lx 8 Lx 33 dB 12dB LOLUX ALC 32 Lx 2000 Lx FULL AUTO SHOOTING 0 dB AUTOMATIC IRIS F1.4 F11 4200 Lx 18000 Lx 1/60 (U-ver.) 1/50 (E-ver.) EEI 1/240 (U-ver.) 1/200 (E-ver.) F16 82