1. What ADC stands for?
ADC is a simplified name of Atmospheric Dispersion Corrector.
2. what is atmospheric dispersion? Basically, The atmospheric dispersion will affect the capturing of high-quality planetary images. Visible light will be refracted when it passes through the atmosphere. Because the refractive index of light of different wavelengths is different, the atmosphere will decompose white light into spectra of different colors like a prism. The lower the angle of the planet, the more obvious the dispersion effect.
3. what is an ADC exactly?
ADC is used to offset the atmospheric dispersion during planetary shooting and visual observation. ADC is composed of a pair of ultra-thin prisms. They can introduce the opposite dispersion that is formed when light passes through the atmosphere to offset the atmospheric dispersion, making the picture sharper. This compact device is designed to reduce color changes caused by atmospheric dispersion and improve the quality of planetary image especially low-altitude planets.
4. How to use it?
Normally, the ADC is placed in between the Barlow lens and the camera. It’s very simple to use an ADC. Just set the ADC level first, and then move two levers by the same amount to control the prism until there is no chromatic aberration at the edge of the planet.
SV199 ADC Advantages:
The main function of ADC is to reduce the color change caused by atmospheric dispersion and improve the imaging effect of planets,especially low-altitude planets。
A pair of prism lenses adopts double-sided coating process to reduce light loss; coating adopts anti-reflective broad-band; applicable range from 300nm to 700nm
Camera and eyepiece side 1.25 inches barrel with T2 male thread; adaption is simple through T2 thread and 1.25 inches barrel on camera side and 1.25 inches barrel on telescope side,A Barlow or planetary camera is permitted thanks to the 1.25” interface on two sides of the tube.
The 2 high-quality 1/4λBK7 prisms with the fully-multi coated on each side act a pear performance in reducing the chromatic aberration. it corrects the false colour introduced by the earth´s atmosphere;double wedge prism with 4.5 degree declination adjustment range
The ADC corrects the dispersion effects of earth´s atmosphere; you will get sharper images of planets and moon; when used for planetary imaging; it changes the clarity of the image dramatically; particularly in the luminance channel when LRGB imaging
Ring scale for adjusting dispersion correction; less fringing; clearer planet photos and more details; the eyepiece or camera installation interface adopts coaxial locking interface ensures sufficient coaxiality FMC prism lens; prism lenses employ a double-sided coating process to reduce light loss make sure the light transmission of the ADC is high
The bubble level of the ADC is accurate to level the horizontal.
Steps for usage:
Steps 1: Turn the center mark to the 0 position, tighten and fix it, and then adjust the two handles to be in line with the center mark. (The center mark is at the intersection of the two rails).
Steps 2: Mount the ADC on the telescope so that it is parallel to the horizontal direction of the telescope's field of view.
Steps 3: Adjust the declination handle oppositely, and the scale on the ADC can ensure that the two long rods rotate the same distance. (When the two rotating handles are on the same vertical line, the two wedge-shaped prisms are at the zero point position (that is, the two prisms are in a parallel state and there is no included angle); When the two handles are rotated in opposite directions to the limit, the maximum angle is 4.5°. During the adjustment process, always observe the changes of the electrical image, do not adjust too much and avoid insufficient adjustment).
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