Astromania 1.25" ADC Atmospheric Dispersion Corrector - Provides a Sharp Planetary Image Showing a lot of Detail, Even When it is just Above The Horizon
Buу 1 gеt 1 Astromania 1.25 ADC Atmospheric Dispersion Corrector - Provides a Sharp Planetary Image Showing a lot of Detail, Even When it is just Above The Horizon A quick review
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| Brand | Astromania |
| Item Weight | 0.15 Kilograms |
| Item Dimensions LxWxH | 3.94 x 3.94 x 3.94 inches |
- 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. This makes you much more flexible in your choice of observing time.
- 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.
- 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.
Product Description
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. Conversely, 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.
The solution - an Astromania ADC Atmospheric Dispersion Corrector! This small component provides a sharp planetary image showing a lot of detail, even when it is just above the horizon. 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.
Clісk Hеrе : ▶▶
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