Adjusting the Lens White Shading
Method to correct the waveform to be more flat by combining the sawtooth-shaped waveform and the parabola waveform when watching the respective waveforms of R, G and B of the video signals.
Note
Coloring may occur in the vertical direction near where the lens aperture is open even when the white shading has been adjusted. This is something that is inherent to lenses and optical systems and is therefore not indicative of a failure or malfunctioning.
1 Attach the lens to the camera.
At this stage, do not forget to connect the lens cable.
2 Set the electronic shutter to OFF and the gain to “L (0 dB).”
3 If the extender is attached to the lens, release the extender function.
4 Perform a menu operation to open the <VF DISPLAY> screen from the VF page, check that the settings selected for the ZEBRA1 DETECT item, ZEBRA2 DETECT item and ZEBRA2 item match the settings shown in the figure below. If they differ, make the appropriate changes, and then close the menu screen.
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5 Set the ZEBRA switch on the viewfinder to [ON].
6 Shoot a white sheet of paper with no unevenness of color.
Note
Since fluorescent lights, mercury lamps and other such kinds of lighting tend to flicker, use a light source which is free from flicker such as sunlight or a halogen lamp.
Firmly tighten the F.f ring clamping screw.
9
Repeat steps 5 to 7 until the lens is in focus at both the telephoto and wide-angle positions.
8

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

Check that the lens aperture is between F4 and F10.

Notes

The zebra pattern will not cover the whole screen if there is any unevenness in the lighting. In this case, make adjustments to the position of the lighting, etc. Make adjustments to the position of the lighting, etc. also when the lens aperture is not between F4 and F10.

Be absolutely sure to leave the electronic shutter at OFF.

8 1Set the WHITE BAL selector switch to [A] or [B], and use the AUTO W/B BAL switch to adjust the white balance automatically (AWB).

2Use the AUTO W/B BAL switch to adjust the black balance automatically (ABB).

3Again, use the AUTO W/B BAL switch to adjust the white balance automatically (AWB).

9 Repeat step 7.

10 Using the menu operation, open the <WHITE SHADING> screen from the MAINTENANCE page and a range of items from R H SAW item to B V PARA item, so that the waveform is more flat.

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H SAW

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Before

 

 

 

 

 

 

After correction

 

 

 

 

 

 

correction

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

H PARA

11 When an extender is fitted to the lens, switch on the extender function, and repeat steps 7-9. The unit stores, as one lens file data item, two different correction values, one for when the extender is fitted and the other for when it is not fitted. When a ratio converter is inserted, the correction value for the latter correction value is used.

118 Preparation: Mounting the lens and Performing the Flange Back and White Shading Adjustments