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
$ 1,690.00
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 61/335 Triplet ED OTA
$ 659.00
Askar
Apochromatic refractor Pro APO AP 90/500 Quintuplet OTA
$ 2,430.00
Omegon
Apochromatic refractor Pro APO AP 104/650 ED OTA + 2'' Field Flattener
Our price:
RRP:
$ 3,449.00
$ 3,390.00
William Optics
Apochromatic refractor AP 81/478 Gran Turismo 81 IV OTA Guidescope-Set
Our price:
RRP:
$ 2,330.00
$ 1,700.00
William Optics
Apochromatic refractor AP 61/360 ZenithStar ZS61 II OTA Guidescope-Set
Our price:
RRP:
$ 1,150.00
$ 820.00
TS Optics
Apochromatic refractor AP 90/540 OTA
$ 1,640.00
Vixen
Apochromatic refractor AP 81/625 SD81S II OTA
$ 1,430.00
Askar
Apochromatic refractor AP 30/135 FMA135 OTA
$ 370.00
Tecnosky
Apochromatic refractor AP 70/420 OWL Triplet OTA
$ 850.00
TS Optics
Apochromatic refractor AP 80/480 CF-APO f/6 FPL55 Triplet OTA
$ 1,270.00
Artesky
Apochromatic refractor AP 80/560 ED OTA
$ 780.00
Levenhuk
Apochromatic refractor AP 80/500 Ra R80 ED OTA
$ 800.00
Omegon
Apochromatic refractor Pro APO AP 80/500 ED Carbon OTA + Field Flattener
Our price:
RRP:
$ 1,449.00
$ 1,390.00
Skywatcher
Apochromatic refractor AP 62/400 Evolux-62ED OTA
$ 455.00
Skywatcher
Apochromatic refractor AP 82/530 Evolux-82ED OTA
$ 780.00
Tecnosky
Apochromatic refractor AP 72/432 ED FPL53
$ 590.00
Tecnosky
Apochromatic refractor AP 102/1100 ED Planet OTA
$ 850.00
Tecnosky
Apochromatic refractor AP LUX 60/360 ED OTA
$ 370.00
Tecnosky
Apochromatic refractor SLD 130/900 V2 OTA
$ 2,650.00
William Optics
Apochromatic refractor AP 71/420 Gran Turismo GT 71 OTA
$ 1,260.00
Omegon
Apochromatic refractor Pro APO AP 108/600 Quintuplet OTA
$ 3,090.00
Artesky
Apochromatic refractor AP 102/714 ED OTA
$ 1,120.00
Levenhuk
Apochromatic refractor AP 72/432 ED FT72 Ra OTA
$ 620.00
Levenhuk
Apochromatic refractor AP 66/400 ED Ra OTA
$ 620.00
Levenhuk
Apochromatic refractor AP 66/400 ED Ra Carbon OTA
$ 740.00
Levenhuk
Apochromatic refractor AP 72/432 Ra OTA
$ 620.00
Levenhuk
Apochromatic refractor AP 80/500 Ra R80 ED Carbon OTA
$ 940.00
Omegon
Apochromatic refractor Photographic Set
Our price:
RRP:
$ 1,637.00
$ 1,390.00
Tecnosky
Apochromatic refractor AP 125/975 OWL ED OTA
$ 2,110.00
Tecnosky
Apochromatic refractor AP 110/660 ED OTA
$ 1,490.00
Askar
Apochromatic refractor AP 40/180 FMA180 OTA
$ 450.00
Omegon
Apochromatic refractor Pro APO AP 76/342 Triplet ED OTA
Our price:
RRP:
$ 1,398.00
$ 1,290.00
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.