Noun:

ऑबर्न लेन्स,

apochromat's Usage Examples:

retrofocus designs and apochromatic corrections.

configurations use three or more elements for achromatic correction or apochromatic correction and higher image quality.

brand is especially noted amongst amateur astronomers for its range of apochromatic refractors, but also produces various types of reflectors, and instruments.

Other apochromats offered by Alpa included.

Ritchey–Chrétien telescope, with piggyback mounted 6-inch (150 mm) F/8 apochromatic refractor, and 4-inch (100 mm) ED refractor.

1989 a new observatory opened in September 1991 with a 10-inch (250 mm) apochromatic refractor telescope and German equatorial mount centered under a 6-meter.

known for his successful optics business, and for the invention of the apochromat.

further increased, as seen in an apochromatic lens or apochromat.

Note that "achromat" and "apochromat" refer to the type of correction (2 or 3 wavelengths.

a combination of two or three aperture sized lenses (see achromat and apochromat for more details).

Dollond"s son Peter invented the apochromat, an improvement on the achromat, in 1763.

company known primarily for its premium brand of speciality eyepieces and apochromatic refractor telescopes.

Abnormal dispersion is required for design of apochromat lenses.