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ZWO 1.25″Atmospheric Dispersion Corrector for Planetary Observing and Imaging- ADC

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ZWO Atmospheric Dispersion Corrector is used to reduces the effect of atmospheric dispersion on lunar and planetary images

The ZWO ADC, or Atmospheric Dispersion Corrector, reduces prismatic smearing during planetary imaging, resulting in images with finer details. It also improves the image when doing visual planetary observations, allowing the observer to see more surface detail.

Optical dispersion is an effect caused by the refractive quality of the atmosphere as light passes through it, and is dependent on the angle of the light as well as its wavelength. Optical dispersion spreads the incoming light into a vertical spectrum of colors, causing the object to appear higher in the sky than it truly is. The amount of “lift” that occurs is exaggerated when objects are closer to the horizon, and because optical dispersion is wavelength dependent, it causes the image to separate into different colors. That is why you will see a bluish fringe on the top of an object, and a red fringe at the bottom when atmospheric dispersion effects are particularly bad.

A correctly adjusted ADC, placed between the camera or eyepiece and a Barlow lens, will reduce the effects of optical dispersion and improve image resolution. It does this by applying the opposite amount of dispersion caused by the atmosphere to the image, and then re-converging the light of the different wavelengths at the focal plane.

The ZWO ADC has three components: The ADC body, a 1.25″ barrel adaptor for the bottom and 1.25″ eyepiece adaptor for the top (with a brass compression ring). The two ends of the ADC body are female T-threaded. Two slots overlap to allow both levers to move together over a wider range to accommodate a changing orientation of the null location (without having to rotate the body).

A nice feature of the ZWO ADC is the white locking screw on the scale marking the horizontal position and the rotatable scale. This allows the null point to be readily seen to set the levers symmetrically on either side and allows you to finely position the null point without having to rotate the body. The black plastic prism adjusting levers also have a nice adjustable frictional resistance using O-rings at their base.

The two H-K9L (BK-7 equivalent) prisms in the device each have 2° deviation angles and are said to be of 1/10wave accuracy.

The prisms are the heart of the ADC

Material: H-K9L(Schott BK7)

Deviation Angle: 2°

UV friendly AR Coating

Some test images show the difference between using ADC and without ADC

Jupiter from Emil with ASI174MM and ZWO ADC


We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.

How do you ship packages?

Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

Do you ship worldwide?

Yes. We provide free shipping to over 200 countries around the world. However, there are some locations we are unable to ship to. If you happen to be located in one of those countries we will contact you.

What about customs?

We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.

How long does shipping take?

Shipping time varies by location. These are our estimates:
Location *Estimated Shipping Time
United States 10-30 Business days
Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
Central & South America 15-30 Business days
Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

Do you provide tracking information?

Yes, you will receive an email once your order ships that contains your tracking information. If you haven’t received tracking info within 5 days, please contact us.

My tracking says “no information available at the moment”.

For some shipping companies, it takes 2-5 business days for the tracking information to update on the system. If your order was placed more than 5 business days ago and there is still no information on your tracking number, please contact us.

Will my items be sent in one package?

For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.

If you have any other questions, please contact us and we will do our best to help you out.


Order cancellation

All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

  • If you did not receive the product within the guaranteed time( 45 days not including 2-5 day processing) you can request a refund or a reshipment.
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We do not issue the refund if:

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  • Your order did not arrive due to exceptional circumstances outside the control of My Blog (i.e. not cleared by customs, delayed by a natural disaster).
  • Other exceptional circumstances outside the control of https://outdoors.ae

*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.

Please do not send your purchase back to us unless we authorise you to do so.

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