Sony PMW320K Product Manual (PMW320 Operating Instruction) - Page 56
Changing the Reference Value for Automatic Iris Adjustment, To change the reference value
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Chapter 3 Adjustments and Settings Changing the Reference Value for Automatic Iris Adjustment The reference value for automatic iris adjustment can be changed to aid the shooting of clear pictures of back-lit subjects, or to prevent blownout highlights. The reference value for the lens iris can be set within the following range with respect to the standard value. • 0.25 to 1 (increasing by increments of 0.25): About 0.25 to 1 stop further open • -0.25 to -1 (decreasing by increments of 0.25): About 0.25 to 1 stop further close Also you can set the area where light detection occurs. To change the reference value 1 Set OPERATION >Auto Iris >Iris Override in the setup menu to On (see page 106). 2 Set the MENU ON/OFF switch to OFF. 3 Turn the MENU knob to change the reference value. Note Be sure to confirm that the current shutter mode is not ECS. An indicator of the current reference value is shown at the iris position indication (see page 32) on the viewfinder screen. To make the iris more open Turn the MENU knob counterclockwise as seen from the front of the camcorder. Select one of 0.25, 0.5, 0.75, or 1. To stop down the iris Turn the MENU knob clockwise as seen from the front of the camcorder. Select one of -0.25, -0.5, -0.75, or -1. The changed reference value is retained until the power of the camcorder is turned off. Even if the reference value is changed, it reverts to the standard value every time the power is turned on. To set the automatic iris window 1 Set OPERATION >Auto Iris >Iris Window Indication in the setup menu to On. The current automatic iris window appears on the viewfinder screen. If it is not necessary to display the auto iris window on the screen, set to Off. 2 Turn the MENU knob to select Iris Window, and then press the knob. 3 Turn the MENU knob until the desired auto iris window appears, and then press the knob. The shaded parts indicate the area where light detection If you select "Var", the following items become effective and you can set the window of the desired size. Set the following items with MAINTENANCE >Auto Iris2. Item Iris Var Width Iris Var Height Iris Var H Pos Iris Var V Pos. Setting The width of the window The height of the window The position of the window in the horizontal direction The position of the window in the vertical direction. When you exit the menu, the auto iris window selected in step 3 appears. Unless you need to keep this window displayed, set OPERATION >Auto Iris >Iris Window Indication in the setup menu to Off. To counter problems with very bright highlights If the subject is too bright, the iris may close too much, leaving the overall image dark, or the highlights may be blown out. In such cases, setting the highlight clip function on reduces the luminance range, avoiding problems from the automatic iris correction. Set OPERATION >Auto Iris >Clip High Light in the setup menu to On. 56 Changing the Reference Value for Automatic Iris Adjustment