ZWO 1.25" Atmospheric Dispersion Corrector

  • Two 1.25-inch Adapters Included! Both female T2 Thread.
  • Backfocus: The body measures 30 mm.
  • Corrects Color Separation due to Atmospheric Conditions!
  • Bubble Level.
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  • Regular price $128.00

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ZWO 1.25" Atmospheric Dispersion Corrector

The 1.25-inch Atmospheric Dispersion Corrector, or ADC with Bubble Level from ZWO, is a brilliant tool for correcting the scattering effect of light rays in the Earth's atmosphere.

Experience Fringe-free Observation

The ADC allows you to view and image bright objects clear of distortions and aberrations. You no longer have to wait for a target to be high enough in the sky for it to be satisfactory to view. With the ADC you can now view objects with perfect clarity no matter their location.

ZWO ADC Operation

The ADC corrects the atmosphere's dispersion effect on planets, stars, and other bright objects by using the chromatic cover of two opposing rotating prisms. Levers on the ADC, when separated by 180 degrees, adjust the two rotating prisms and change the compensation effect from nothing to its apex. The attached bubble level helps line this all up!

The atmosphere's dispersion effect influences some wavelengths differently than others. Adjusting the ADC's levers provides a simple way to compensate for this.


Color imaging a planet without an ADC will inevitably result in color fringing and distortion. When the presence of this fringing and distortion is taken away in processing, you wind up with an image with a decreased resolution that cannot be reclaimed. While Mono imaging separates Red, Green, and Blue images, superimposing them helps offset this to some extent. To take advantage of an image's full resolution, a Luminance image should be taken.
Use the ZWO ADC, which removes distortions and image shift issues, resulting in an image with more detail. Finally, further processing can produce a complete enhanced final image.

OPT Product Number: ZWO-ADC


Accessory ConnectionBoth Female/ Both T2
Accessory TypeAtmospheric Dispersion Corrector
Deviation Angle2 degrees
Free ShippingYes
Height of Body30mm
Included AdaptersTwo 1.25in/ One for each end
Surface AccuracyWavelength/10 at 632.8nm



  • 1.25-inch Atmospheric Dispersion Corrector.
  • 1.25-inch Adapter with Female T2 Thread X2.
  • Attached Bubble Level.

Customer Reviews

4.8 Based on 14 Reviews
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Robert G.
United States United States

Tricky But Effective

Takes practice and fiddling to understand it, but in the end it's effective.

jenkins d.
United States United States


With NO, NONE. NOTTA instructions, ZWO products are the worst. Optically, it is great. GO on line and they show you how to use and calibrate it in a software package from another company. there is no instructions on how to use it with their OWN software. The capture program has a feature for the ADC and there is NO mention of it or how to use it. I am very disappointed with this part of the package. They seem to be out growing themselves and will lose customers. Hopefully I can find some time to go online and read/watch some tutorials on how to use it. oh well. it affects the light in the way it was descried. how to get the best out of it will take a little while....

United States United States

The ADC came with no instructions at all

Very disappointed that there were no instructions at all with the device. That is simply unacceptable that one should go find a video on a web article for its correct use. No excuses.

United States United States

Don’t know how it works, but it does!

I view from a heavily light polluted location (backyard, Las Vegas) so I try to mitigate some of that. This accessory works beautifully! My images are sharper and brighter, and the difference in detail is astounding. So easy to use it comes without instructions, but since it arrived it hasn’t been off my telescope.

Don C.
United States


Excellent product, excellent service, and excellent delivery

James P.
United States


This is an excellent piece of equipment, I find it very effective. My only complaint is how dirty the prisms were out of the box-I had to disassemble, clean and reassemble. But that was an easy process, and the ADC works as advertised. Be advised that, as w/any ADC, moving the prisms causes image shift, so keeping a planet in-frame at high focal lengths while adjusting can be a challenge.