Chromatic Aberration Compensation (CAC)
CAC is a function that automatically corrects registration errors mainly caused by slight chromatic aberration, which cannot be corrected with lenses, and minimizes color weepage on the images.
What is the chromatic aberration?
Chromatic aberration means magnification ratio chromatic aberration. Magnification ratio chromatic aberration is caused by differences in the red (R), green (G), and blue (B) refractive indexes of a lens. The lens itself corrects chromatic aberration but the astigmatism remains in the surrounding area in particular. The zooming ratio, iris, and focal distance involves complicated chromatic aberration phenomena in a zoom lens. Images have registration errors.
B
G
R
CAC operation
For the 4 lenses listed on the left
1 Install the lens on the unit and connect the lens connector.
2 Open the <CAC ADJ> screen on the MAINTENANCE page.
3 Turn on the CAC CONTROL.
If the lens product number recorded on the unit coincides with the product number of the connected lens, the CAC data stored in the unit are read out automatically.
Recording for Settings and Adjustments
Chromatic aberration compensation function
To correct the chromatic aberration, record the chromatic aberration characteristics of the lens for the zooming ratio, iris, and focal distance in the unit and connect a lens suitable for these characteristics. Then perform the correction in accordance with the zooming ratio, iris, and focus distance of the lens.
The CAC data for the following 4 kinds of lenses are stored in the unit at the time of shipment from the factory.
Indication on the unit | Supporting lens model No. | ||
HA16 | HA16 | ||
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HA22 | HA22 | ||
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HJ17e | 7.6B IASE | HJ17E | 7.6B IASE |
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HJ22e | 7.6B IASE | HJ22E | 7.6B IASE |
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Note
After the release of this unit, visit our Web site at the address given below for details on new lenses compatible with this function and any changes in this function.
Confirmation of the CAC operation status
1 When the menu is not displayed on the viewfinder screen, press the MODE CHECK button.
If letters of the “CAC” are indicated at the left top of the viewfinder screen, the CAC is operating properly. If the letters of “CAC” are not indicated, the CAC is not operating.
2 Open <VF INDICATOR2> screen on the VF page and set the menu option CAC to “ON”, and then the letters of “CAC” are indicated in the left top of the viewfinder screen.
Adjustments and Settings for Recording: Chromatic Aberration Compensation (CAC) 105