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Astromania 1.25" ADC Atmospheric Dispersion Corrector - Provides a sharp planetary image showing a lot of detail, even when it is just above the horiz

SKU_AM_ADC
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$139.50
$154.99
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3-9
$150.99
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Astromania 1.25" ADC Atmospheric Dispersion Corrector - Provides a sharp planetary image showing a lot of detail, even when it is just above the horiz
 

What is an 'Atmospheric Dispersion Corrector' or ADC?

The light from stars and planets is refracted by the layer of air when it passes through the Earth's atmosphere. This refraction varies greatly depending on the wavelength of light; an effect which is known as 'dispersion'. This dispersion causes irritating colour fringing on the edges of planetary discs. The atmosphere thus acts basically like the lens of a telescope with chromatic aberration. C onversely, this means that you will even see colour fringing if you are using a high-quality telescope with no inherent chromatic aberration. The dispersion of the atmosphere cannot be corrected by the optics of your telescope. This is where the compact ADC instrument comes in - the ADC basically consists of two rotatable prisms made ​​of silicate glass. The prisms produce a certain extent of own chromatic aberration themselves, which is opposite to the atmospheric dispersion. The ADC hence corrects this irritating effect. The relative position of the prisms can be freely adjusted via a small slide.
 

Who needs the corrector?

The effect of atmospheric dispersion strongly depends on the elevation (height) of the object observed appears in the sky. The lower the object is in the sky, the longer the path its light takes through the atmosphere and hence the greater the dispersion produced. The bright planets in particular are not often very high in the sky, especially if you live at high latitudes. The ADC lets you observe planets, not only when they are high in the sky but even when rising and setting, with high brilliance and colour and without chromatic aberration. This makes you much more flexible in your choice of observing time.

 

Product description:


Colour fringing:


Colour fringing is only the most obvious characteristic of dispersion. Especially in photography, dispersion affects contrast adversely, such as in the impressive examples shown. One can increase image contrast in processing, but not without some loss of resolution. This makes the use of the ADC particularly attractive for astrophotography and for this reason this accessory comes with a T2 connection at both ends.


Specially coated:

 

The glass surfaces are specially coated to ensure the ADC has very high light transmittance. The coating is optimized for the range of 300 to 700 nanometres - specifically for astrophotography.


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.


 

  • 【Practical Design】The ADC unit is a special corrector designed for planetary observers and photographers.The ADC lets you observe planets, not only when they are high in the sky but even when rising and setting, with high brilliance and colour and without chromatic aberration.
  • 【Ultra-low Profile】Also suitable for visual observing and bino-viewers, ring scale for adjusting dispersion correction.Corrects atmospheric dispersion - less colour fringing, sharper planetary photos and more detail.
  • 【2.5°Adjustment Range】Two mutually adjustable prisms: 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.
  • 【Three-piece kit】ADC with two adapters and T-thread: Centre unit - ADC with prisms -front and rear equipped with T-2 thread;telescope-side 1.25" tube with filter thread and T-2 thread;T-2 to 1.25" eyepiece adapter with M42*0.75 male thread and compression ring - for cameras and eyepieces.
  • 【Specially Coated】The glass surfaces are specially coated to ensure the ADC has very high light transmittance. The coating is optimized for the range of 300 to 700 nanometres - specifically for astrophotography. Entirely of metal, black anodized.
  • We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address.
  • Your order will be shipped within 2 business day normally once we receive your payment.
  • We will provide an online tracking number to you once the item has been shipped.
  • If you have any problem with shipment, please feel free to contact us. We will track the shipment and get back to you as soon as possible with a reply. Our goal is customer satisfaction!
  • If you have special needs or you live in area where only specific carrier is available please inform us prior to shipping.
Average rating: 5.0 based on 64 reviews
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