Canon EOS-1Ds Mark III Поради та техніки - Сторінка 33

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Testing Your Own Cameras

& Lenses

VI. EQUIPMENT CALIBRATION

ISSUES

If the camera and lens are being operated correctly, but images remain consistently out

of focus, there is always the possibility that the camera or lens is not performing

according to factory specifications. EOS cameras and EF lenses are precision

instruments, and as such they require precision adjustments to perform at peak

efficiency. Although Canon makes every effort to calibrate the AF systems of EOS

cameras in the manufacturing process, a small percentage of cameras require

calibration adjustments at the Factory Service Center (FSC) after sale.

AF system calibration at the FSC involves a series of tests to determine the positioning

accuracy of mechanical components such as the image sensor and reflex mirror

assemblies. Once these potential problem issues have been eliminated, test images are

taken using a "tool lens" with known performance characteristics. The testing method

enables technicians to ensure that the camera is performing well within tolerances for

AF accuracy. Once this has been done with the tool lens, it becomes possible to check

the performance of other lenses the customer may have.

Because each autofocus lens contains its own microcomputer and many other internal

devices such as focusing motors and diaphragm actuators, lenses occasionally require

calibration. If a focusing error is detected, the circuitry of the lens itself can be adjusted

to ensure that it is operating according to design specs. Calibrating a lens does not

compromise its performance with other camera bodies because the calibration

standards for the lens are independent from the calibration standards for the body.

Please keep in mind that we do not recommend sending equipment to the Factory

Service Center unless you are sure that the source of your image quality problems is not

one of the issues we have already discussed in this document.

Although photographers in the field cannot duplicate the testing capabilities of a Canon

Factory Service Center, it is certainly possible to test cameras and lenses at home or in a

studio to check their performance. The following procedure may help you determine

whether your camera equipment is in need of calibration.

1. Perform your focusing test at a reasonable light level (office lighting or brighter) to

ensure optimum results.

2. Place the camera on a sturdy tripod and use a remote switch when firing the shutter.

For maximum quality, consider the use of mirror lock. (C.Fn 12 on EOS-1 class Digital

VI. EQUIPMENT CALIBRATION ISSUES