The ZWO Atmospheric Dispersion Corrector is an optical correction device designed for astrophotography, primarily recommended for high-resolution planetary and lunar imaging. It helps to eliminate the prism effect (the splitting of incoming light from celestial objects into its components) that occurs in the layers of the atmosphere with varying density. This effect arises as the light from a celestial object passes through the Earth's atmosphere and reaches the observer or the camera. In practice, chromatic aberration appears as red or bluish fringes at the edges of the photographed celestial object. When using monochrome cameras, this aberration results in blurred planetary images.
The ZWO Atmospheric Dispersion Corrector effectively "re-corrects" and compensates for the chromatic aberration caused by the Earth's atmosphere. The device is particularly suitable for astrophotography due to the fact that the degree of the prism's corrective effect is adjustable, allowing precise tuning to match the current atmospheric dispersion. The atmospheric dispersion depends on current weather conditions (state of the atmosphere), the altitude of the photographed object above the horizon, as well as the type and aperture of the telescope used for imaging.
With the ZWO Atmospheric Dispersion Corrector, the necessary degree of adjustment can always be applied to achieve high-quality planetary and lunar photographs.
The device fits 1.25" focusers.