Showing papers on "Apochromat published in 1970"
Patent•
12 Oct 1970
TL;DR: An eight lens apochromatic objective which includes two cemented collecting lens elements each consisting of three lenses that enclose the diaphragm is described in this article. But this is not the case in our case.
Abstract: An eight lens apochromatic objective which includes two cemented collecting lens elements each consisting of three lenses that enclose the diaphragm; each cemented collective lens element includes a biconcave lens made of short flint glass in the center adjoined by two further lenses; each three-component and cemented collective element is adjoined at predetermined spacing by a single meniscus lens, these two single lenses enclosing a three-lens cemented collective lens elements; the collective lenses enclosing the short flint biconcave lens are made from glasses with long-crown properties, whereby one of these collective lenses brings about the apochromatic correction for the blue color and the other for the red color.
2 citations
01 Aug 1970
TL;DR: In this paper, the Hartmann dispersion relation was used to obtain optical elements with the opposite chromatic aberration to that of classical lenses, which can be used for the reduction of the chromatic abnormality of the classical lenses.
Abstract: Chromatic aberration of a thin solid gradient lens is analysed by means of the Hartmann dispersion relation. From the analysis it follows that it is possible to obtain optical elements with the opposite chromatic aberration to that of classical lenses. These elements may be utilised, for example, for the reduction of the chromatic aberration of classical lenses.
1 citations
TL;DR: A simple focal isolation device is described, wherein two plano-convex lenses which are aspherized which are made of fused silica to be useful in the 1900-2500-A region.
Abstract: The chromatic aberration of a single lens could be used to advantage sometimes as in a focal isolation device. If a single lens is used, the changing of the wavelength becomes a little inconvenient. A simple focal isolation device is described, wherein two plano-convex lenses which are aspherized are used. These lenses are made of fused silica to be useful in the 1900-2500-A region. The piano sides of these lenses are aspherized to correct for the spherical aberration. The entrance and exit holes are fixed in position and by moving the lenses by the same amount in opposite directions, the wavelength of maximum transmission could be changed. Some theoretical transmission curves are also presented at various wavelength settings.