The optical apochromatic refractor is formed from two substantially different curvature and lens material, a doublet lens is often achieved by using a low-dispersion glass. Some lenses use apochromatic 3 or even slower.
Apochromatic optics is different from the achromatic because guarantees of fuocheggiatura 3 primary colors (red, green and blue) on the same focal plane (or the difference is minimal) ensuring the absence of chromatic aberration and thus providing a high fidelity color of the objects observed. Often, these schemes have apochromatic optical aplanatic, ie free of spherical aberration.
along the optical path are distributed on the inner wall of the tube a series of diaphragms razor blade, in order to increase the contrast of images.
apochromatic telescopes are generally suitable observation of all the celestial objects offering both visual and photographic images of the highest quality, they are limited only by the opening , often modest (VERY costs are high). In addition there is one most appropriate category for photography of extended objects with properties astrographs. The apochromatic - Astrographs apochromatic differ from common to the aperture ratio than forced (instead f/4...6 f/7...10) and the presence of a group field flattener (consisting of one or more lenses) along the optical path that can guarantee flat field even enough to cover the large format camera (6x6cm).
Apochromatic optics is different from the achromatic because guarantees of fuocheggiatura 3 primary colors (red, green and blue) on the same focal plane (or the difference is minimal) ensuring the absence of chromatic aberration and thus providing a high fidelity color of the objects observed. Often, these schemes have apochromatic optical aplanatic, ie free of spherical aberration.
along the optical path are distributed on the inner wall of the tube a series of diaphragms razor blade, in order to increase the contrast of images.
apochromatic telescopes are generally suitable observation of all the celestial objects offering both visual and photographic images of the highest quality, they are limited only by the opening , often modest (VERY costs are high). In addition there is one most appropriate category for photography of extended objects with properties astrographs. The apochromatic - Astrographs apochromatic differ from common to the aperture ratio than forced (instead f/4...6 f/7...10) and the presence of a group field flattener (consisting of one or more lenses) along the optical path that can guarantee flat field even enough to cover the large format camera (6x6cm).
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