Imaging optical systems require careful analysis and planning for successful production. Key steps should include evaluating the system sensitivities, manufacturability, and developing and understanding of parameters for tolerancing. In zoom lenses these steps are even more critical due to added complexity. Fundamental zoom lens assessment for manufacturability and tolerancing, including case study information, are discussed.
The main purpose of this paper is to introduce a high speed zoom lens for photography. The lens operates with a full field angle that encompasses more than 86 degrees and the corner illumination is more than 60 percent at the wide end. In addition, the paper provides guidance on how to effectively use an aspheric surface in the first lens group consisting of an NPNPP (negative, positive, negative, positive, and positive). This treatment includes distortion considerations. Useful design solutions using an aspheric surface are introduced along with assessment of the resulting designs. Finally, a strategy to correct field curvature in this zoom lens is shown with an example.
Recent development in CMOS and digital camera technology has accelerated the business and market share
of digital cinematography. In terms of optical design, this technology has increased the need to carefully
consider pixel pitch and characteristics of the imager. When the field angle at the wide end, zoom ratio, and
F-number are specified, choosing an appropriate zoom lens type is crucial. In addition, appropriate power
distributions and lens configurations are required. At points near the wide end of a zoom lens, it is known that
an aspheric surface is an effective means to correct off-axis aberrations. On the other hand, optical designers
have to focus on manufacturability of aspheric surfaces and perform required analysis with respect to the
surface shape. Centration errors aside, it is also important to know the sensitivity to aspheric shape errors and
their effect on image quality. In this paper, wide angle cine zoom lens design examples are introduced and
their main characteristics are described. Moreover, technical challenges are pointed out and solutions are
proposed.
The process behind compact cameras, capable of achieving high zoom ratios are described. In addition to the development of a suitable new type of zoom lens, the internal focusing is essential to the design. The study focuses upon current major lens types, especially a three-group zoom lens which are composed of positive, positive and negative refractive powers for respective lens groups. First, requirements on the development of zoom lenses are described. Then properties of lens types are discussed. Using similar specifications, applications of standard zoom lenses providing higher aperture are shown. The characteristics of these zoom lenses are then summarized.
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