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:
$ 3,890.00
Our price:
$ 3,790.00
APM
Apochromatic refractor AP 140/980 SD OTA
RRP:
$ 3,950.00
Our price:
$ 3,480.00
Vixen
Apochromatic refractor AP 103/825 ED AX103S Sphinx SXP2 Starbook Ten GoTo
$ 10,500.00
William Optics
Apochromatic refractor AP 156/1217 Fluorostar Gray OTA
$ 9,800.00
Omegon
Telescope Pro APO 72/400 Quintuplet CEM26 LiteRoc
RRP:
$ 3,790.00
Our price:
$ 3,490.00
OPT
Apochromatic refractor Radian AP 61/275 Raptor OTA
$ 2,550.00
William Optics
Apochromatic refractor AP 156/1217 Fluorostar Red OTA
$ 9,800.00
William Optics
Apochromatic refractor Pleiades 181 AP 181/998 Astrograph OTA
$ 24,000.00
Omegon
Apochromatic refractor Pro APO AP 66/400 ED SkyGuider Pro
$ 1,190.00
TeleVue
Apochromatic refractor AP 127/660 TVNP127is OTA
RRP:
$ 11,700.00
Our price:
$ 9,936.00
TeleVue
Apochromatic refractor AP 127/680 astrograph OTA
RRP:
$ 12,000.00
Our price:
$ 10,234.00
William Optics
Apochromatic refractor AP Fluorostar 120/780 Space Gray OTA
$ 4,880.00
William Optics
Apochromatic refractor AP Fluorostar 120/780 Red OTA
$ 4,880.00
William Optics
Apochromatic refractor AP Fluorostar 120/780 Gold OTA
$ 4,880.00
Omegon
Apochromatic refractor Pro APO AP 85/560 ED Triplet OTA
$ 1,690.00
William Optics
Apochromatic refractor AP 132/925 Fluorostar Gold OTA
$ 6,100.00
Omegon
Apochromatic refractor Pro APO AP 106/700 Triplet ED FCD-100
RRP:
$ 1,990.00
Our price:
$ 1,899.00
Omegon
Apochromatic refractor Pro APO AP 104/650 ED OTA + 2'' Field Flattener
RRP:
$ 2,059.00
Our price:
$ 1,999.00
Explore Scientific
Apochromatic refractor AP 80/480 ED Alu iEXOS-100 PMC-8 Wi-Fi GoTo
RRP:
$ 1,880.00
Our price:
$ 1,520.00
William Optics
Apochromatic refractor AP 132/925 Fluorostar Space Gray OTA
$ 6,400.00
William Optics
Apochromatic refractor Pleiades 111 AP 111/528 Astrograph OTA
$ 5,000.00
Vixen
Apochromatic refractor AP 80/600 ED80Sf Advanced Polaris AP-SM Starbook One
$ 2,910.00
Omegon
Apochromatic Refractor Pro APO AP 71/490 Quadruplet OTA
$ 899.00
Explore Scientific
Apochromatic refractor AP 102/714 ED FCD-100 CF Hexafoc iEXOS-100 PMC-8 Wi-Fi GoTo
RRP:
$ 3,300.00
Our price:
$ 2,970.00
Omegon
Apochromatic refractor Pro APO AP 96/575 Triplet ED FCD-100
$ 1,290.00
Vixen
Apochromatic refractor AP 80/600 ED80Sf Advanced Polaris
$ 2,380.00
Omegon
Apochromatic refractor Pro APO 130/650 ED3Q OTA
$ 4,990.00
Vixen
Apochromatic refractor AP 103/825 ED AX103S OTA
$ 3,490.00
William Optics
Apochromatic refractor AP 76/365 UltraCat 76 WIFD
$ 3,020.00
Askar
Apochromatic refractor AP 120/840 Triplet OTA
$ 2,320.00
William Optics
Apochromatic refractor AP 91/540 Space Gray OTA
$ 2,790.00
Askar
Apochromatic refractor AP 50/200 ACL200 OTA
$ 1,160.00
TeleVue
Apochromatic refractor AP 85/600 TV-85 OTA
RRP:
$ 3,720.00
Our price:
$ 3,173.00
Skywatcher
Apochromatic refractor AP 150/1050 ESPRIT-150ED Professional OTA
$ 7,700.00
TeleVue
AP 85/600 TV-85 OTA Apochromatic refractor
RRP:
$ 3,720.00
Our price:
$ 3,173.00
William Optics
Apochromatic refractor AP 108/518 UltraCat WIFD
$ 4,880.00
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.