Pierro Astro ADC MK3 Atmospheric Dispersion Corrector MK III

Pierro Astro ADC MK3 Atmospheric Dispersion Corrector MK III

The ADC MK3 corrects the color shift caused by atmospheric dispersion, increasing the sharpness of the moon and planets
The ADC dispersion corrector corrects the refraction of light by the earth's atmosphere. When the moon and planets are close to the horizon, there is an effect similar to that of the prism. The objects are warped, they get a color shift.

You can correct this with the ADC corrector, the sharpness increases.

♦ Telescope side M48, camera side T2 connection

♦ Suitable for photography and observation

♦ Correction is done simply by twisting two prisms during observation or photography

♦ You can see the result directly in the eyepiece or on the photo

♦ Very well suited for Venus, as it is UV-permeable


What is an atmospheric dispersion corrector:

This AD corrector is a small unit that corrects the refraction of light in the atmosphere. To put it simply, you can often see color fringes on bright objects such as planets when observing them with a telescope. A large object like Jupiter has a red and blue color fringe and also appears distorted. This effect is caused by the refraction of light in the atmosphere. The atmosphere here acts like a prism. This effect is more or less strong depending on how high the object is above the horizon. The deeper the object is, the stronger the effect comes into play. Since the planets are only very low, especially in northern countries, the effect is particularly strong here and the correction is particularly worthwhile here.

The ADC corrects this effect and allows you to observe the objects free from chromatic aberration and distortion. You no longer have to wait long for the object to be observed to be high enough in the sky for an acceptable observation. Now you can watch in brilliant quality at any time.


How does the Pierro Astro ADC corrector work:

Our atmosphere refracts light to different degrees, depending on the wavelength. Red light is refracted differently than blue light. The closer the object is to the horizon, the stronger the effect.

By turning the knurled head of the adjustment lever on the ADC, you adjust the two prisms in the corrector and thus counteract the effect of the earth's atmosphere, you neutralize this color shift.


application in photography

If you take color photos of planets without the ADC, you have color shifts and distortions. Even if this effect can be largely eliminated during image processing, it still results in a loss of resolution that cannot be restored. Recording the individual colors using filters helps a little, but the ADC also maximizes the result here. The improvement is easily visible.

By using the ADC, you get a significantly better resolved image by eliminating distortion and image shifts. Compare the photos of the planet Saturn with and without ADC. The corrector also has a certain effect on the color channels in RGB images, as can be seen in the Jupiter images. The corrector has the strongest effect on the blue channel.

A special feature is the use of quartz glass for the prisms. Since this material transmits UV, one can, for example, record Venus in the ultraviolet and thus make more details visible.


What's new on the Pierro Astro ADC MKIII:

♦ only one lever for orientation and adjustment of the prisms
♦ Separation of orientation and potency - much more practical
♦ 120° rotation range
♦ better coating on all surfaces


A special feature is the use of quartz glass for the prisms. Since this material transmits UV, one can, for example, record Venus in the ultraviolet and thus make more details visible.


Important information on use:

For the correct effect, the corrector must be correctly oriented to the horizon. This is usually the case when the compensator handle is parallel to the horizon line in the focuser.

By turning the handle you can now twist the prisms in such a way that their effects no longer cancel each other out. If the picture gets worse, it has to be adjusted in the other direction.

It should be noted that in the case of equatorially mounted telescopes the position relative to the horizon changes over time, which of course must be taken into account.


Camera/eyepiece connection: T2 external thread
Telescope connection: M48 internal thread
Coating: multi-coating
Housing: aluminum
Prisms: Fused Silica (UV Transmissive) with 1/10 PTV
Clear opening: 24mm
Number of prisms: 2 wedge-shaped prisms - can be rotated in relation to one another
Optimum working distance: 50 mm
Optimum focal ratio of the telescope: f/20 to f/10
Length: 25 mm (without external thread)
Diameter: 50mm
Weight: 200g

♦ Atmospheric dispersion compensator
♦ Stable protective caps on both sides