ZWO NEW 1.25″ ADC (Atmospheric Dispersion Corrector)

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Available around the end of May

Available on backorder

SKU: ZWO ADC Category:

Product Description

ZWO ADC is voted as  “HOT SKY PRODUCT – 2017” by SKY&TELESCOPE magazine!

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






The prisms are the heart of the ADC

Material: H-K9L(Schott BK7)

Surface Accuracy: λ/10@632.8nm

Deviation Angle: 2°


UV friendly AR Coating




Martin Lewis tells you what an ADC is and why do we need it?How to use it?

Here is a review of ZWO’s ADC by Martin Lewis.

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



Jupiter from Emil with ASI174MM and ZWO ADC



Before first usage of this product read manuals and install correct drivers and software.


  • Fast Shipping(amount ≧ 199USD) for free
  • Fast Shipping(amount < 199USD) : $20.00
  • Free Shipping(amount < 199USD) (Air Mail, 2-3months) (Free)

If you can’t get the air mail package after 2months, please let us know ASAP:



  1. Fast Shipping: we will choose DHL, UPS, FedEx etc to deliver it. Usually you will get your package within one month. We provide free fast shipping for order ≧ $199 or charge extra $20 for order < $199.
  2. Free Shipping: we will ship via DGM or China Post Registered Air Mail. It usually costs 1-2 months to reach US or Europe and costs 2-3 months to reach far places.
  3. Customers from Brazil and Chile should leave a message to provide your CPF or CNPJ as your custom needs it.
  4. Customers from Russia need to provide the complete English name with three words as well as the English shipping address.


Update of logistics information

Due to the incompatibility of post office networks in many countries, in a long period, logistics information won’t be updated for parcels exported via ePacket/China Post Registered Air Mail/EMS before the arrival of destination country.


Delivery efficiency

It will take around 60-90 days for shipment via ePacket/China Post Registered Air Mail/EMS, which can’t be guaranteed due to force majeure.
If you need the parcel urgently/in a short time, other fast shipping except for EMS would be highly recommended.


Tracking site


China air mail:



  • The price list on our website is USD without tax.
  • Please note that buyers are liable to pay tax involved, such as Import tax, VAT , customs handling fee, etc. The additional fees may be collected at time of delivery by courier.
  • For best local service we advise customers buy our cameras form local dealers.

Warranty and Return Policy

  • We provide 2-year warranty for our products, we will offer the repair service for free within warranty period. After the warranty period, we will continue to provide repair support and service on a charged basis. We do not provide any replacement unless ZWO confirmed the product is DOA (Dead On Arrival).
  • This warranty does not apply to damage that occurred as a result of abuse or misuse, or caused by a fall or any other transportation failures after purchase.
  • Customer must pay for shipping when shipping the camera back for repair or replacement. If we confirm you can get a replacement, goods must be returned with all accessories, instructions, etc and must be suitably packed.
  • If you get a faulty camera, please contact us as soon as possible though email: Please describe the problem in detail and we will do our best to help you solve the problem. Most instances perceived problems are simply bad driver install or software configuration.
  • We will provide you RMA number if your camera requires warranty repair. We refuse any return without RMA number!
  • For customers who bought the camera from our dealer, dealer is responsible for the customer service for you.

Do you have question, answer or comment? Post here!

  1. Avatar


    Hi again guys,

    I needed to carefully clean my ZWO ADC because of dust motes (even though it was new). I had no problem cleaning and re-assembling but I wonder if I could have installed one or both of the lenses wrong/backwards? Does it matter? Is there a coating on one side The reason I ask is that the adjustment angles with the levers seems a little odd and extreme when reducing the RGB mis-alignment…

    All the best


    • Avatar


      If it is placed in the wrong way it will have impact.


  2. Avatar


    Hi guys,

    I needed to carefully clean my ZWO ADC because of dust (even though new). I had no problem cleaning and re-assembling but I wonder if I could have installed one or both of the lenses wrong/backwards? Does it matter? The reason I ask is that the adjustment angles with the levers seems a little odd to reduce color alignment…

    Btw, I’m getting an ASIAIR next week and am VERY excited about the features! I’m especially looking forward to the Polar Alignment routine and the Nikon DSLR connectivity as well as for using my ASI071, etc. Thank you very much for all the hard work in creating such a useful imaging tool and thanks for listening to your customers requests and suggestions.


    • Avatar


      Hi James,
      We have a document about how to clean the ADC, if it is place in a wrong way it will have impacts.
      You can send an email to for help.


  3. Avatar


    Is there a 2″ eyepiece compatible version?


    • Avatar


      Sorry, we don’t have, only support 1.25″


  4. Avatar


    Is there an adapter to attach my 290mc to the ADC? I would like to remove the eyepiece holder if possible. I need to reduce back focus so I can use an external focuser on my C9.25. Thanks


    • Avatar


      Hi Tim
      Don’t worry about back focus of C9.25, even add a external focuser, it won’t be a problem. I recommend keep eyepiece holder on ADC, if you insist to take it off, you will need a T2-T2 adapter to connect the ADC body with camera body.



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