Topics covered in geometrical optics include: ray-tracing, aberrations, lens design, apertures and stops, radiometry and photometry.

涵盖的主题包括：几何光学射线追踪，畸变，镜头设计，孔径和停止，辐射计和光度法。

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The dispersion caused from the chromatic aberrations of lens is smaller than that from diffraction effects of it.

与衍射效应产生的色散相比，透镜本身的折射率色散很小。

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There are many aberrations in single lens, it makes the physics significance of result of measuring become disorder, therefore, improving proposal is raised in this paper.

单透镜存在各种象差，会使测量结果的物理意义变得不清，因此本文提出了一些改进意见。

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The use of Special Low Dispersion (SLD) glass accompanied by aspherical lens elements not only compensates for a variety of aberrations, but also allows for a more compact size.

ENGADGET: Sigma DP3 Merrill packs a Foveon X3 sensor and a fixed F2.8, 75mm-equivalent lens

Offering exceptional optical performance to provide minimal distortion and chromatic aberrations while suppressing ghosting and flare, the advanced lens unit allows for higher shutter speed and captures stunningly clear images.

ENGADGET: Panasonic's Lumix line gets a lot more crowded

It differs from its predecessor, the DP1x, because its lens now includes one "F" Low Dispersion glass element to correct aberrations, and its resolution has grown by moving from Foveon's 14.6-megapixel APS-C size image sensor to the 46-megapixel APS-C image sensor found in the company's flagship SLR, the Sigma SD1 Merrill.

ENGADGET: Sigma finally announces price and availability for DP1 Merrill compact