By Milton Laikin
ISBN-10: 0585404232
ISBN-13: 9780585404233
ISBN-10: 0824705076
ISBN-13: 9780824705077
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Example text
CHANGING THE NUMBER OF ELEMENTS Sometimes during the course of the design, the designer will note that an element is becoming very thin and of very low power. In this case the program’s curvature bounds and thickness bounds are invoked to make it a nearly zero power element. Then the element is removed from the prescription. A tougher case is when the lens image quality is not adequate. The usual advice is to add an element. But where should such an element be added, and how? There are several choices.
For this illustration, both elements were made the same diameter. Note 1. All edges should have some break. This prevents chipping during manufacture and subsequent assembly. Note 2. Maximum deviation in minutes of arc is sometimes given, or minutes of arc maximum wedge. Note 3. Often lenses are used at wavelengths other than the visual region (the IR), and so it is important to define the wavelength at which the accuracy and irregularity specification apply. 6328 micron ) in their testing. Note 4.
So for convenience, we need only to do the above at the central wavelength. However, there is in general a different vignetting and pupil shift for all off-axis field points and configurations (a zoom lens). In a typical computer program, vignetting and pupil shift are handled as follows. VTT(J) is the vignetting for a particular field and configuration. It is expressed as a fraction of the aberrated entrance pupil diameter. It applies only in the meridional direction. See Fig. 1-4. VTS(J) is the same but in the sagital direction.
Lens design by Milton Laikin
by Robert
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