"G Lens" — the culmination of Sony optical expertise. |
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Chromatic aberration |
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Effective correction of chromatic aberration
You may have noticed an unnatural colour fringe on the edges of objects in photos taken with regular glass lenses. This phenomenon, called chromatic aberration, is significantly reduced in photos taken with Sony’s sophisticated "G Lens". |
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Extra-low Dispersion lens |
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The HX1 corrects chromatic aberration through various advances, including an extra-low dispersion lens element (ED lens) composed of ED glass. Through reduced and irregular dispersion, as well as reduced refraction, ED lens significantly reduces chromatic aberration in comparison with regular lens. |
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With regular optical glass lenses, chromatic aberration generally increases as the focal length increases (such as in high-zoom ratio and telephoto lenses). This results in reduced contrast, increased colour fringe and an overall loss of detail. Extra-low Dispersion lenses, developed as a solution to this problem, are composed of ED glass featuring significantly lower dispersion and a lower refractive index than regular optical glass. ED glass also features uniquely irregular dispersion that dramatically reduces chromatic aberration. Even when shooting with a fully open aperture, Extra-low Dispersion lenses deliver crisp, clear, high-contrast images from corner to corner. Now that Sony employs these lenses, highly effective correction of chromatic aberration has become a reality. |
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Ultra-high refractive index lens element |
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This lens element contributes to exceptional lens contrast at all focal lengths from wide-angle to telephoto. A much higher refractive index than regular glass is what makes the difference. |
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Ultra-high refractive index lenses utilize glass with a refractive index significantly higher than that of regular glass, resulting in much more effective correction of spherical aberration. Contrast, which tends to deteriorate in wide-angle and high-zoom ratio lenses made of regular glass, is also enhanced. Moreover, ultra-high refractive index lenses tend to be smaller in lens thickness and diameter than regular glass lenses, resulting in reduced overall lens unit dimensions. |
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Aspherical lens element |
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The aspherical lens element in Sony's "G Lens" achieves much higher lens contrast than conventional spherical lenses. It effectively corrects spherical aberration, minimises bleeding, and prevents distortion during zooming. |
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Light beams passing through the edges and centre of conventional spherical lenses do not precisely converge at a focal point on the focal plane. This phenomenon, called spherical aberration, can be partially corrected by minimising the curvature of the main lens and incorporating an additional concave lens. However, it is impossible to completely correct this problem with a spherical lens. As a result, aspherical lenses were developed as a replacement. Aspherical lenses produce high-contrast images with minimal bleeding even when the aperture is kept open. Not only do they prevent spherical aberration, but they also effectively prevent distortion when zooming. In addition, they enable the use of fewer lens elements, thus contributing to lens compactness. |
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Superb limiting resolution |
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The HX1 lens features excellent limiting resolution. Since lens contrast increases in proportion to limiting resolution, the HX1 lens also delivers beautiful high-contrast images. This limiting resolution is clearly illustrated in the following charts, with distance from centre measured on the horizontal axis (image centre: 0%, 4 corners: 100%) and limiting resolution (LPH*) measured on the vertical axis. The "G Lens" exhibits high resolution from centre to periphery.
* Lines per image height |
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