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Apochromats are refractors whose lenses are laid out in such a way as to combine at least three colours at a common focal point. This suppresses the chromatic aberration that is typical of refractor telescopes. Without this correction, bright objects like the Moon or the planets would have disruptive colour fringes.

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Omegon Apochromatic refractor Pro APO 85/560 ED Triplet CEM26 LiteRoc
Omegon
Apochromatic refractor Pro APO 85/560 ED Triplet CEM26 LiteRoc
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RRP:  $ 3,908.00
$ 3,890.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 66/400 ED SkyGuider Pro
Omegon
Apochromatic refractor Pro APO AP 66/400 ED SkyGuider Pro
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RRP:  $ 1,735.00
$ 1,690.00
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Omegon Telescope Pro APO 72/400 Quintuplet CEM26 LiteRoc
Omegon
Telescope Pro APO 72/400 Quintuplet CEM26 LiteRoc
Our price:
RRP:  $ 3,348.00
$ 3,290.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO 94/517 Triplet ED CEM26 LiteRoc
Omegon
Apochromatic refractor Pro APO 94/517 Triplet ED CEM26 LiteRoc
Our price:
RRP:  $ 3,548.00
$ 3,490.00
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Omegon Apochromatic refractor Pro APO AP 61/335 Triplet ED OTA
Omegon
Apochromatic refractor Pro APO AP 61/335 Triplet ED OTA
$ 659.00
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Omegon Apochromatic refractor Pro APO AP 104/650 ED OTA + 2'' Field Flattener
Omegon
Apochromatic refractor Pro APO AP 104/650 ED OTA + 2'' Field Flattener
Our price:
RRP:  $ 3,449.00
$ 3,390.00
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Omegon Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA + Field Flattener
Omegon
Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA + Field Flattener
Our price:
RRP:  $ 1,449.00
$ 1,390.00
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Omegon Apochromatic refractor Pro APO AP 108/600 Quintuplet OTA
Omegon
Apochromatic refractor Pro APO AP 108/600 Quintuplet OTA
Sale price:
$ 3,090.00
$ 2,519.00
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Omegon Apochromatic refractor Pro APO AP 76/342 Triplet ED OTA
Omegon
Apochromatic refractor Pro APO AP 76/342 Triplet ED OTA
Our price:
RRP:  $ 1,398.00
$ 1,290.00
Product can be shipped as of 15.01.2023
Omegon Apochromatic refractor Photographic Set
Omegon
Apochromatic refractor Photographic Set
Our price:
RRP:  $ 1,637.00
$ 1,390.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 110/660 ED Carbon OTA
Omegon
Apochromatic refractor Pro APO AP 110/660 ED Carbon OTA
Sale price:
$ 1,790.00
$ 1,429.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 104/650 ED Triplet OTA
Omegon
Apochromatic refractor Pro APO AP 104/650 ED Triplet OTA
$ 3,190.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 121/678 Quintuplet OTA
Omegon
Apochromatic refractor Pro APO AP 121/678 Quintuplet OTA
$ 4,990.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA
Omegon
Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA
Sale price:
$ 1,190.00
$ 949.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 66/400 ED OTA
Omegon
Apochromatic refractor Pro APO AP 66/400 ED OTA
Sale price:
$ 669.00
$ 519.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP Photography Scope 72/432 ED OTA
Omegon
Apochromatic refractor Pro APO AP Photography Scope 72/432 ED OTA
$ 599.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 85/560 ED Triplet OTA
Omegon
Apochromatic refractor Pro APO AP 85/560 ED Triplet OTA
Sale price:
$ 1,890.00
$ 1,519.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 76/418 Triplet ED OTA
Omegon
Apochromatic refractor Pro APO AP 76/418 Triplet ED OTA
$ 999.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 72/400 Quintuplet OTA
Omegon
Apochromatic refractor Pro APO AP 72/400 Quintuplet OTA
$ 1,290.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 94/517 Triplet ED OTA
Omegon
Apochromatic refractor Pro APO AP 94/517 Triplet ED OTA
$ 1,490.00
ready for shipping in 24 h
Omegon Apochromatic refractor Pro APO AP 140/910 Triplet OTA
Omegon
Apochromatic refractor Pro APO AP 140/910 Triplet OTA
$ 5,290.00
Product can be shipped as of 15.01.2023

Refractors are telescopes where the objective consist of one or more glass lenses. The lens refracts light to a focal point. However, the exact location of the focal point depends on the wavelength (colour) of the light. This causes chromatic aberration which is noticeable as a coloured fringe around bright objects. In physics, this dependence of refraction on wavelength is called dispersion.

There is no really precise definition of the term apochromat. Most apochromats have an objective consisting of two lenses, in which a special glass is deployed. This so-called ED glass has particularly low dispersion (the abbreviation ED stands for extra-low dispersion). The ED apochromats provides a largely pure-colour image.

An objective consisting of three or four lenses will provide an even sharper image. These apochromats are called triplets or quadruplets. These can be as good as mirror optics in term of colour purity.