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Telescope accessories > Astrophotography > Optical accessories > ADCs & active optics > Omegon ADC atmospheric dispersion corrector
Product no.: 53049

ADC atmospheric dispersion corrector

$ 179.00 incl. VAT, plus shipping costs
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Product description

ADC (Atmospheric Dispersion Corrector) - sharpens your planetary photos when near the horizon

Who hasn't experienced this problem - Saturn is just above the horizon, appearing as a blurred disc in the telescope? A mere blob in the sky. Taking planetary photos is not worthwhile in this situation - where the planet's light is refracted by the dense and thick layers of atmosphere leading to colour fringing. One would normally have to wait hours until the planet rose higher before it could be usefully observed. But sometimes that is not possible anyway due the orientation of the planet's orbit.

The solution - an Omegon ADC! This small component provides a sharp planetary image showing a lot of detail, even when it is just above the horizon.

The advantages in a nutshell

  • corrects atmospheric dispersion - less colour fringing, sharper planetary photos and more detail.
  • 2.5° adjustment range - two mutually adjustable prisms
  • ultra-low profile - also suitable for visual observing and bino-viewers
  • ring scale for adjusting dispersion correction
  • 1.25" adapter with T-ring and compression ring - for cameras and eyepieces
  • telescope-side 1.25" tube with filter thread

How the dispersion of the Earth's atmosphere makes objects beautiful
When we look at a bright star on the horizon, we often see it 'twinkling' and flickering in the most beautiful colours - nice for romantics, but bad for astronomers! This is because the light of the star is being heavily refracted by the thick layers of the earth's atmosphere. This phenomenon is called 'atmospheric dispersion' and creates colour fringing around astronomical objects and blurs details. The lower an object is on the horizon, the stronger the refraction, with blue refracted much more than red. Omegon's ADC lets you transform a colour-fringed planet into a recognisable object. This job is done by two mutually rotatable prisms - these simulate their own colour fringing, but in exactly the opposite direction to the dispersion of the Earth's atmosphere, hence compensating for it.

Three-piece kit - ADC with two adapters and T-thread
The dispersion corrector is a modular unit consisting of three parts

  • 1.25" socket with T-2 thread
  • centre unit - ADC with prisms
  • T-2 to 1.25" eyepiece adapter with additional T-2 thread and compression ring

It couldn't be easier to assemble - the ADC unit fits any telescope with a 1.25" or T-2 connection and can also be used without an adapter. Another advantage - of course you can also use the two adapters (that you would otherwise would have to buy extra) for other purposes.

Adjustable prisms made of high light transmission BK-7 glass
The two wedge-shaped prisms are made from BK7 glass equipped with a broadband coating to give high light transmission. The ADC unit achieves light transmission of up to 99% in visible light, so you still have an image of the planet that is as bright as normal. The prisms can be moved by 2.5° by means of two small levers - more than on many other models. As a result, you can set a low or very high colour deflection. The result is an even better correction of the dispersion - especially on the horizon. Another plus - a rotatable ring scale gives you the chance to quickly find the optimal setting for your next observing.

When and why should you use the Omegon ADC?
The ADC unit is a special corrector designed for planetary observers and photographers. The planets Saturn and Jupiter will only reach a small elevation above the horizon during the next few years anyway, so without an ADC corrector you would have to spend a lot of time on low-detail, 'mushy' looking planets. Why not avoid this problem and use Omegon's ADC? Professionals have been using ADCs for years, even to compensate when observing at large declinations where there is still a little fringing.
Is it useful for other objects besides planets? Some amateurs use the ADC for observing binary stars. Finding Sirius-B, the white dwarf in the Sirius system, is also easier using an ADC. Now ADCs have also arrived for amateurs - grab the chance of taking perfect planetary photos.

Additional features

  • front and rear equipped with T-2 thread
  • 30mm optically usable diameter
  • somewhat UV-transparent (300nm=10%, 350nm=48%, 400nm=94%)
  • infrared - 780-1000nm, 92% to 70% transmission
  • made entirely of metal, black anodized
  • dust cap

Included in delivery

  • Atmospheric Dispersion Corrector with two adapters
  • dust caps
  • operating instructions (English)

Please note that an exact horizon alignment of the ADC is necessary for it to function properly!

Our expert comment:

The use of the ADC depends on the telescope used. In order for the ADC to function optimally, the system should have an aperture ratio smaller than f/10. For SC telescopes, this is automatically the case, but with other optics, the use of a Barlow lens may be useful



Connector (at camera end)
Connection (to the telescope)
Connection ( to eyepiece)
Connector (other end)
Coating of optical system
Backfocus (mm)


Weight (g)
Outer material
Length (mm)

Area of application

Visually useful
Useful for photographs
Omegon ADC atmospheric dispersion corrector
Use these two levers to adjust the prism

Omegon ADC atmospheric dispersion corrector
The ADC (Atmospheric Dispersion Corrector) is split into three parts. The two adapters have 1.25" and T-2 connectors

Omegon ADC atmospheric dispersion corrector
The ADC with a Touptek camera

Omegon ADC atmospheric dispersion corrector

Flame Nebula and Horsehead Nebula, taken with the Omegon ADC, photo: Cesar Pinheiro

Omegon ADC atmospheric dispersion corrector

Saturn, taken with the Omegon ADC, photo: Cesar Pinheiro

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