|The dispersion corrector is a component that corrects the refraction of light in the atmosphere. Simply explained, you often see colour fringes on bright low objects when observing with the telescope. Large or bright objects such as Jupiter, Venus and Sirius have a red and blue colour fringe and also appear distorted near the horizon. This effect is caused by the refraction of light in the atmosphere and is called atmospheric dispersion. The atmosphere acts like a prism here and fans out the incoming light beam into its spectral components. This effect is stronger the lower the object is above the horizon.
Using the ADK is very simple. With the multi-function dial, both the direction of the dispersion (zenith) and the strength of the correction can be set. In the zero position of the dispersion, a small mechanical detent can be felt. This makes it very easy to find the neutral position. The maximum correction is reached after one turn. After a further turn, there is again no correction in the neutral position. If you continue to turn, the maximum correction in the opposite direction is reached after one turn and the initial position after another turn. The adjusting wheel must always point in the direction of dispersion.
The special feature of this model: