Logitech Reviewer’s Guide: QuickCam Pro 9000 and QuickCam Pro for Notebooks –
Page 7
Part 2: Image Quality
A good image reproduces its subject as close to reality as possible. Qualities of a good
image include clarity, detail, sharpness, color accuracy and tonal range. Usually, the
higher the resolution, the better the image. But if the lens doesn’t capture the light
accurately, the image may still be speckled or washed-out or have any number of other
aberrations.
For webcams, good image quality is a product of several systems working in concert to
deliver a crystal clear image to your monitor. The major elements of the image system
include the lens and the sensor.
Logitech’s new QuickCam Pro-series webcams use Carl Zeiss optics and a premium
autofocus system to deliver unparalleled image quality.
2.1 Carl Zeiss
The new Logitech QuickCam Pro-series webcams are the first to incorporate Carl Zeiss
optics. These webcams meet the specification of the Carl Zeiss Tessar® lens system, a
design renowned for image sharpness.
Elegant and precision-engineered, the
Carl Zeiss® family of companies has a
storied history of producing lens designs
that are used for a variety of
applications, including high-end and
consumer cameras, electron
microscopes and space photography.
Though the original Tessar lens had a
four-element design, the Tessar lens
used in the Logitech webcams is a
further technological development.
The Logitech webcams use a five-element
lens arranged into four optical elements.
That is, two of the lenses (Number 3 and 4)
in the lens stack are cemented together. As a result, the lens focuses the light onto the
sensor with maximum detail and minimal aberrations.
2. Aspheric lens
3 & 4. Doublet lens
5. Aspheric lens
1. Aspheric lens
Elegant and simple, the compact and lightweight Tessar design makes it the perfect
choice for Logitech webcams, which must conserve on weight and bulk.
2.2 Autofocus
Current webcams often have a tough time automatically focusing on moving or close-up
subjects. The resulting image usually looks hazy and out-of-focus.
Logitech addressed this problem by building an autofocus system into its newest
webcams: Logitech® QuickCam® Pro 9000 and Logitech® QuickCam® Pro for
Notebooks.
Logitech's autofocus system zeroes in on the subject—such as a person's face or even
a business card—in the center of the frame. When the subject moves, the webcam
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