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
RRP:
$ 3,908.00
Our price:
$ 3,890.00
Omegon
Apochromatic refractor Pro APO AP 66/400 ED SkyGuider Pro
RRP:
$ 1,735.00
Our price:
$ 1,650.00
Omegon
Telescope Pro APO 72/400 Quintuplet CEM26 LiteRoc
RRP:
$ 3,348.00
Our price:
$ 3,290.00
Omegon
Apochromatic refractor Pro APO 94/517 Triplet ED CEM26 LiteRoc
RRP:
$ 3,548.00
Our price:
$ 3,490.00
Omegon
Apochromatic refractor Pro APO AP 85/510 Triplet ED FCD-100
RRP:
$ 1,199.00
Our price:
$ 949.00
Omegon
Apochromatic refractor Pro APO AP 106/700 Triplet ED FCD-100
$ 1,990.00
Sale price:
$ 1,607.00
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 61/360 Triplet ED OTA + Pro Reducer 0,75x
RRP:
$ 1,064.00
Our price:
$ 999.00
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
RRP:
$ 3,449.00
Our price:
$ 3,390.00
TS Optics
Apochromatic refractor AP 90/540 OTA
$ 1,710.00
William Optics
Apochromatic refractor AP 81/478 Gran Turismo 81 IV OTA Guidescope-Set
RRP:
$ 2,420.00
Our price:
$ 1,950.00
Omegon
Apochromatic refractor Pro APO AP 30/135 OTA
RRP:
$ 439.00
Our price:
$ 395.00
Skywatcher
Apochromatic refractor AP 62/400 Evolux-62ED Star Adventurer GTi Wi-Fi GoTo SET
RRP:
$ 1,650.00
Our price:
$ 1,550.00
Artesky
Apochromatic refractor AP 80/560 ED OTA
$ 600.00
Levenhuk
Apochromatic refractor AP 72/432 Ra OTA
$ 560.00
Omegon
Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA + Field Flattener
RRP:
$ 1,449.00
Our price:
$ 1,390.00
Skywatcher
Apochromatic refractor AP 62/400 Evolux-62ED OTA
$ 491.00
Skywatcher
Apochromatic refractor AP 82/530 Evolux-82ED OTA
$ 830.00
Tecnosky
Apochromatic refractor AP LUX 60/360 ED OTA
$ 385.00
Tecnosky
Apochromatic refractor AP 110/660 ED OTA
$ 1,550.00
TS Optics
Apochromatic refractor AP 60/360 ED TSMPT60 OTA
RRP:
$ 441.00
Our price:
$ 396.00
Askar
Apochromatic refractor AP 40/180 FMA180 OTA
$ 469.00
Askar
Apochromatic refractor AP 40/180 FMA180PRO OTA
$ 580.00
Askar
Apochromatic refractor AP 60/360 80/500 V OTA
$ 2,210.00
Omegon
Apochromatic refractor Pro APO AP 40/180 OTA
$ 499.00
TS Optics
Apochromatic refractor AP 80/480 CF-APO f/6 FPL55 Triplet OTA
$ 1,330.00
William Optics
Apochromatic refractor AP 71/420 Gran Turismo GT 71 OTA
$ 1,320.00
William Optics
Apochromatic refractor AP 81/478 GranTurismo 81WIFD OTA
$ 2,210.00
Askar
Apochromatic refractor AP 130/1000 130PHQ OTA
$ 4,270.00
William Optics
Apochromatic refractor AP 61/300 RedCat 61 OTA
$ 1,990.00
William Optics
Apochromatic refractor AP 71/350 RedCat 71 WIFD OTA
$ 2,420.00
William Optics
Apochromatic refractor AP 51/178 MiniCat WIFD OTA
$ 1,320.00
ZWO
Apochromatic refractor FF130 AP 130/1000 Quadruplet OTA
$ 4,270.00
Skywatcher
Apochromatic refractor AP 62/400 Evolux-62ED Star Adventurer GTi Wi-Fi GoTo SET
RRP:
$ 1,540.00
Our price:
$ 1,440.00
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.