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
Meade
Apochromatic refractor AP 115/805 Series 6000 LX85 GoTo
Our price:
RRP:
$ 5,200.00
$ 4,250.00
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 85/510 Triplet ED FCD-100
$ 1,199.00
Omegon
Apochromatic refractor Pro APO AP 96/575 Triplet ED FCD-100
$ 1,490.00
Omegon
Apochromatic refractor Pro APO AP 61/360 Triplet ED OTA
$ 779.00
Omegon
Apochromatic refractor Pro APO AP 140/910 Triplet ED FCD-100
$ 4,490.00
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 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
William Optics
Apochromatic refractor AP 81/478 Gran Turismo 81 IV OTA Guidescope-Set
Our price:
RRP:
$ 2,340.00
$ 1,890.00
TS Optics
Apochromatic refractor AP 90/540 OTA
$ 1,660.00
William Optics
Apochromatic refractor AP 71/420 Gran Turismo GT 71 OTA
$ 1,280.00
Askar
Apochromatic refractor AP 40/180 FMA180 OTA
$ 454.00
Askar
Apochromatic refractor AP 60/360 80/500 V OTA
$ 2,140.00
Skywatcher
Apochromatic refractor AP 62/400 Evolux-62ED OTA
$ 476.00
TS Optics
Apochromatic refractor AP 80/480 CF-APO f/6 FPL55 Triplet OTA
$ 1,280.00
Omegon
Apochromatic refractor Pro APO AP 40/180 OTA
Our price:
RRP:
$ 569.00
$ 429.90
Skywatcher
Apochromatic refractor AP 62/400 Evolux-62ED Star Adventurer GTi Wi-Fi GoTo SET
Our price:
RRP:
$ 1,600.00
$ 1,500.00
Skywatcher
Apochromatic refractor AP 62/400 Evolux-62ED Star Adventurer GTi Wi-Fi GoTo SET
Our price:
RRP:
$ 1,490.00
$ 1,390.00
Tecnosky
Apochromatic refractor AP LUX 60/360 ED OTA
$ 373.00
Skywatcher
Apochromatic refractor AP 82/530 Evolux-82ED OTA
$ 800.00
Artesky
Apochromatic refractor AP 80/560 ED OTA
$ 580.00
Omegon
Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA + Field Flattener
Our price:
RRP:
$ 1,449.00
$ 1,390.00
Sharpstar
Apochromatic refractor AP 100/550 Z4 OTA
Our price:
RRP:
$ 3,160.00
$ 2,830.00
Askar
Apochromatic refractor AP 107/740 107PHQ OTA
$ 3,150.00
Askar
Apochromatic refractor AP 40/180 FMA180PRO OTA
$ 570.00
William Optics
Apochromatic refractor AP 81/478 GranTurismo 81WIFD OTA
$ 2,140.00
Tecnosky
Apochromatic refractor AP 70/420 OWL Triplet OTA
$ 860.00
Omegon
Apochromatic refractor Pro APO AP 108/600 Quintuplet OTA
Our price:
RRP:
$ 3,090.00
$ 2,845.00
William Optics
Apochromatic refractor AP 61/300 RedCat 61 OTA
$ 1,930.00
Askar
Apochromatic refractor AP 80/600 80PHQ
Our price:
RRP:
$ 2,350.00
$ 2,140.00
Tecnosky
Apochromatic refractor SLD 130/900 V2 OTA
$ 2,670.00
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.