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Anti-aliasing Filter: Effect on Focus
The anti-aliasing filter causes the distance indicator on your lens to show that an object is
closer than it actually is. This is particularly true when you use a wide angle lens. It also
slightly increases the minimum distance at which you can focus.
☛ The anti-aliasing filter does not affect focusing, either manual or automatic.
Sharpening
Your camera is equipped with an anti-aliasing filter, an optical filter mounted inside the
camera in front of the electronic imager. This filter improves overall image quality at the
expense of a small loss of sharpness in the image. In general, you will want to sharpen
images when the anti-aliasing filter is installed. There may be special situations where you
will not want to sharpen, or where you want to remove the anti-aliasing filter.
When you use the DCS Host software with your DCS camera, you can specify whether
you want the image sharpened. To use the Sharpening feature, you may need to change
settings on both your camera and in the DCS Host software.
The anti-aliasing filter uses optical design to reduce or eliminate the high-frequency image
patterning problems associated with single-shot digital capture and interpolation. The
optical effect causes a small change in how lenses perform compared to cameras without
the filter installed. The auto-focus capability adapts to the presence of the anti-aliasing
filter and will compensate for any variations under normal use.
If you choose Manual focus, be advised that zoom lenses experiences a shift in the focus
point as the focal length of the zoom is changed. If you zoom into your subject matter for
close focus, then zoom out to compose your image, the focus point will change. This is
easily remedied by only focusing at the zoom setting used to capture the image, or
reverting to auto-focus and allowing the focusing computer to accommodate the
anti-aliasing filter’s optical effect.
Preparing for Sharpening in the DCS Host software
You can set a camera property that tells the DCS Host software whether sharpening should
be applied. Refer to “Enabling Sharpening” on page 6-23.
For information on the Sharpening function, refer to the KODAK PROFESSIONAL DCS
Host Software User’s Manual on the DCS Host Software CD included with your camera.