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- Preparation
- Mounting and adjusting the lens
- White shading compensation

# White shading compensation

## Adjusting the white shading

This is a method of combining the sawtooth shaped waveform and parabola waveform to compensate to a flatter waveform based on the respective R, G and B waveforms of the video signal.

We recommend adjusting the R, G and B waveforms in the horizontal and vertical directions while monitoring them on the waveform monitor.

Be sure to set [DS.GAIN] and [D.ZOOM] to [OFF] before adjusting white shading.

Before white shading compensation

After white shading compensation

Set the camera for adjustment.

Mount the lens on the camera.

- Make sure to connect the lens cable.

Set the <SHUTTER> switch to <OFF>, and the <GAIN> switch to <L> (0 dB).

If the lens is equipped with an extender function, release the extender function.

Make sure that [HD] is set in the main menu → [PAINT] → [GAMMA] → [GAMMA MODE SEL]. Also, make sure that [ZEBRA1 DETECT] is set to [70%], [ZEBRA2 DETECT] is set to [85%], and [ZEBRA2] is set to [SPOT] in the main menu → [VF] → [VF DISPLAY], and then close the menu screen.

- Change the settings if they are different.

Set the <ZEBRA> switch in the viewfinder to <ON>.

Set the screen.

Shoot a white sheet of paper with no unevenness of color for the whole screen.

Set the lens aperture to manual, and adjust it so that the zebra pattern covers the whole viewfinder screen.

- Make sure that the lens aperture control is between F4 to F11.

- Adjust the position of the lighting because the zebra pattern will not cover the whole screen if there is any unevenness in the lighting.

- Make adjustments to avoid several light sources of different color temperature (e.g. fluorescent lights and halogen lamp) from illuminating on the white paper.

Adjust the white balance/black balance.

Set the <WHITE BAL> switch to <A> or <B>, and use the <AUTO W/B BAL> switch to adjust white balance automatically (AWB).

Use the <AUTO W/B BAL> switch to adjust black balance automatically (ABB).

Use the <AUTO W/B BAL> switch to adjust white balance automatically (AWB) again.

Perform step 2-2 again.

Adjust white shading.

Adjust from [R H SAW] to [B V PARA] in the main menu → [MAINTENANCE] → [WHITE SHADING] to make a flatter waveform.

If the lens is equipped with an extender function, turn on the extender function and repeat steps 2 to 5.

Compensation values are stored on the camera as a single lens file data using two patterns for when the lens is equipped and not equipped with an extender pattern.

Adjustment values are saved in memory, so there is no need to re-adjust white shading even after turning the camera off.

NOTE

- Coloring may occur in the vertical direction near where the lens aperture is open (OPEN) even when the white shading has been adjusted, but this is something that is inherent to optical systems and is therefore not indicative of a malfunction.

- Since fluorescent lights, mercury lamps, and other such kinds of lighting tend to flicker, use a light source which is less subject to flickering such as sunlight or a halogen lamp.

- Make adjustments to the position of the lighting, etc. also when the lens aperture is not between F4 and F11.

- Make sure to leave the <SHUTTER> switch at <OFF>.

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