Canon EOS-1Ds Mark III Suggerimenti e tecniche - Pagina 34

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SLRs.) If you are using an IS Lens, turn off the Image Stabilizer.

3. Select a focusing target with adequate detail from center to edge. A newspaper page

is a good choice.

4. Make sure that the target is totally flat and as parallel as possible to the camera.

5. Set the camera to One-Shot AF and manually select the center focusing point.

6. Compose the picture so that the test target fills the frame from edge to edge.

7. For each of your lenses, make one exposure at the maximum aperture of the lens and

another at f/8, varying the shutter speed if necessary to adjust the exposure level as

indicated by the histogram on the camera's LCD monitor.

Evaluation Method A: Use EOS Capture or RemoteCapture software to analyze your

images as soon as they have been transferred to your computer. RemoteCapture has a

100% magnification viewing option. (If you are using EOS Capture, you can use EOS

Viewer Utility or Digital Photo Professional to enlarge the images.)

Evaluation Method B: Open the images in your computer and make two copies of them:

one "as is" and another with a liberal amount of unsharp mask applied. Here are some

recommended settings: Amount, 300%; Radius, 0.3 pixels; Threshold 0 pixels.

Make letter-size prints on a high-quality inkjet printer using photo paper and photo ink.

Compare the results. If the camera has a consistent focusing problem with several

different lenses, then it's reasonable to assume the camera needs an adjustment. If you

are getting sharp results from most lenses but not all, then it's reasonable to assume

that the lens in question may need an adjustment.

VI. EQUIPMENT CALIBRATION ISSUES