ZWO 1.25″ Atmospheric Dispersion Corrector / ADC
ZWO 1.25″ Atmospheric Dispersion Corrector / ADCZWO 1.25″ Atmospheric Dispersion Corrector / ADCZWO 1.25″ Atmospheric Dispersion Corrector / ADC

ZWO 1.25″ Atmospheric Dispersion Corrector / ADC

  (4 Reviews)
✓ 2 year warranty


3x in stock shipped 1-2 working days

About this product

Model:  zwo_adc
Part Number:  ZWO-ADC

Latest version with bubble level to aid zero position alignment

The ZWO Atmospheric Dispersion Corrector (ADC) is the first of it's kind, designed and manufactured by astronomers for astronomers.

Significantly reduces the prismatic smearing (atmospheric dispersion) caused by light passing through moisture in our atmosphere, a common problem encountered when observing/imaging planets at low altitudes.  

The aberration is viewed as false colour then corrected via the positioning of two high quality 1/10 Lambda surface quality prisms, resulting in views and images of planets with noticeably improved surface detail.  

Note: For best results position the ZWO ADC immediately before the eyepiece and place other optical accessories (barlow, diagonal, etc) in front of the ADC (telescope side).  I.e. eyepiece -> ADC -> barlow -> diagonal -> telescope. 


  • Threads: T2 Male and Female
  • Optics: 2 Prisms
  • Material: H-K9L(Schott BK7)
  • Surface Accuracy: λ/10@632.8nm
  • Deviation Angle: 2°
  • UV friendly Anti-reflective (AR) Coating
  • ADC Body Height: Approximately 30mm

UV Friendly AR Coating

Customer reviews

Average Rating (4 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
very good product
Thursday, 7 March 2019  | 

very good product

Rating (max 5):  
Monday, 11 June 2018  | 

The only way to get sharp images of the planets visual and for planetary imaging.

Rating (max 5):  
Rescue Your Planets
Friday, 8 June 2018  | 

This little gem works wonders. This year (2018) when planets are all very low it has let me get better images than the previous year.

I must admit that I have struggled to get an approach to setting it that works better than trial and error. Set the ADC to the neutral position (arms together) and get a view of the planet that is greatly over-exposed, this typically blurs so it shows blue and orange edges. Align the ADC arms with the direction of the blur, then open them out until the coloured edges disappear. If they get worse, rotate the ADC 180 degrees and try again.

The effect is quite dramatic, but adjustment is not hyper-critical as the view/image just gets better and better as you get close to the correct position and even a bit under or over corrected will be vastly better than no ADC at all.

When you go to a normally exposed image, you will see it is much sharper than without the ADC. I'm sure it will work well for visual use as well.

Here's a link to an image using the adc:

Rating (max 5):  
ZWO 1.25 ADC
Wednesday, 7 February 2018  | 

Another very well made product from ZWO. Yes, there are more expensive versions on the market but for the specific use I require this for this offering from ZWO is perfect. I have not yet managed to get any images through this due to very poor conditions however visually this does greatly make a difference. No instructions with product but they can be found on the internet as can video demonstrations.


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