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112
Preparation: Mounting the lens and Performing the Flange Back and White Shading Adjustments
8 Repeat steps 5 to 7 until the lens is in focus at both the
telephoto and wide-angle positions.
9 Firmly tighten the F.f ring clamping screw.
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.
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.
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.
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.
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.
Adjusting the Lens White Shading
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).
H SAW
H PARA
Before
correction
After correction
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