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.
Omegon
Apochromatic refractor Pro APO 85/560 ED Triplet CEM26 LiteRoc
Our price:
RRP:
$ 3,908.00
$ 3,890.00
Omegon
Apochromatic refractor Pro APO AP 66/400 ED SkyGuider Pro
Our price:
RRP:
$ 1,735.00
$ 1,650.00
Omegon
Telescope Pro APO 72/400 Quintuplet CEM26 LiteRoc
Our price:
RRP:
$ 3,348.00
$ 3,290.00
Omegon
Apochromatic refractor Pro APO 94/517 Triplet ED CEM26 LiteRoc
Our price:
RRP:
$ 3,548.00
$ 3,490.00
Omegon
Apochromatic refractor Pro APO AP 61/360 Triplet ED OTA
$ 779.00
Omegon
Apochromatic refractor Pro APO AP 96/575 Triplet ED FCD-100
$ 1,490.00
Omegon
Apochromatic refractor Pro APO AP 85/510 Triplet ED FCD-100
$ 1,199.00
Omegon
Apochromatic refractor Pro APO AP 76/342 Triplet ED OTA
Our price:
RRP:
$ 1,398.00
$ 1,290.00
Omegon
Apochromatic refractor Pro APO AP 106/700 Triplet ED FCD-100
Our price:
RRP:
$ 1,999.00
$ 1,899.00
Omegon
Apochromatic refractor Pro APO AP 140/910 Triplet ED FCD-100
$ 4,490.00
Omegon
Apochromatic refractor Pro APO AP 104/650 ED OTA + 2'' Field Flattener
Our price:
RRP:
$ 3,449.00
$ 3,390.00
Omegon
Apochromatic refractor Pro APO AP 140/672 Triplet OTA
Our price:
RRP:
$ 5,939.00
$ 4,949.00
Omegon
Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA + Field Flattener
Our price:
RRP:
$ 1,449.00
$ 1,390.00
Omegon
Apochromatic refractor Pro APO AP 40/180 OTA
Our price:
RRP:
$ 569.00
$ 429.90
Omegon
Apochromatic refractor Pro APO AP 108/600 Quintuplet OTA
Our price:
RRP:
$ 3,090.00
$ 2,845.00
Omegon
Apochromatic refractor Pro APO AP 30/135 OTA
Our price:
RRP:
$ 439.00
$ 395.00
Omegon
Apochromatic refractor Pro APO AP 110/660 ED Carbon OTA
$ 1,790.00
Omegon
Apochromatic refractor Pro APO AP 104/650 ED Triplet OTA
$ 3,190.00
Omegon
Apochromatic refractor Pro APO AP 121/678 Quintuplet OTA
$ 4,990.00
Omegon
Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA
$ 1,190.00
Omegon
Apochromatic refractor Pro APO AP 66/400 ED OTA
$ 669.00
Omegon
Apochromatic refractor Pro APO AP 85/560 ED Triplet OTA
$ 1,890.00
Omegon
Apochromatic refractor Pro APO AP Photography Scope 72/432 ED OTA
$ 599.00
Omegon
Apochromatic refractor Pro APO AP 76/418 Triplet ED OTA
$ 999.00
Omegon
Apochromatic refractor Pro APO AP 72/400 Quintuplet OTA
$ 1,290.00
Omegon
Apochromatic refractor Pro APO AP 94/517 Triplet ED OTA
$ 1,490.00
Omegon
Apochromatic refractor Pro APO AP 140/910 Triplet OTA
Our price:
RRP:
$ 5,290.00
$ 3,999.00
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.