ZWO ASI 120MM Mini USB 2.0 Mono Camera

ZWO ASI 120MM Mini USB 2.0 Mono Camera

  (3 Reviews)
✓ 2 year warranty


Out of stock due 7-10 working days

About this product

Model:  zwo_asi120mm_mini
Part Number:  ASI120MINI

Compatible with the new ZWO ASiair smiley

The ASI120MM Mini is a very capable guide camera that can handle most setups with ease, including most OAG configurations. 

Peak QE of 75% (better than the ICX618) and no Fixed-Pattern-Noise!  

Supports 35 FPS at it's maximum 1280 x 960 resolution and long time exposures up to 1000s!  

Compared to ICX618 based cameras the ZWO ASI120MM offers faster frame-rate, slightly higher sensitivity in visual light and more pixels for lunar imaging. 

The sensor is protected by an anti-reflection clear optical window. If imaging the Moon or planets we recommend fitting a 1.25" UV/IR rejection filter. 

The ASI120MM’s mono sensor can also be used with specialised UV or methane band filters, as well as infrared passing filters for lunar and planetary imaging (i.e. Baader IR-Pass, Red and Orange visual filters). IR-passing filters cut short wavelengths which prevents atmospheric dispersion softening the image. 

Note: The ASI120MM has a Micron sensor which might produce Newton Rings when used with solar telescopes. (Cameras fitted with Sony sensors are better in these circumstances).


  • 1.2 Megapixels, 1280 x 960 pixel 1/3" AR0130CS CMOS Mono Sensor
  • 3.75μm Square Pixels
  • 12bit ADC
  • Peak QE ~75%
  • 4.0e Read Noise, 13000e Full Well
  • ST4 Port
  • USB2.0 Type C
  • Weighs only 60g!


ZWO ASI120 cameras have have been reviewed at world most popular astronomy magazines. Please click links below to read PDF documents:

All ZWO cameras include a 2-year warranty. 

Camera Field of View Simulator

ASI120MM Mini Astrophotography Performance

The ASI120 mini camera offers very good performance for planetary imaging and guiding. Low read noise, high dynamic range, QE peak 75%, AR protective window and much more.

ASI120MM Mini QE Curve

Absolute QE Curve, we estimate the Peak Value is over 75%.

ASI120MM Mini vs ASI120MM-S

Compared with the ASI120MM-S camera, the ASI120mini is smaller, lighter weight, and it can reach focus at the same position as an eyepiece.

USB2.0 & ST4 Ports

USB 2.0 Port: The mini camera has one USB2.0 type C port. Type C is very popular in mobile phones and it is reversible so it doesn't matter which way around you insert the plug.

ST4 Port: To connect directly to a mounts auto guide port.

Connection Drawing

  1. M28.5-CS adapter
  2. CS-C adapter
  3. 1.25″ extender
  4. 1.25″ filter

Mechanical Drawing

What's in the box?

What's in the box

  • ASI120MM Mini Camera
  • 1.25" Cap
  • 0.5m USB2.0 Cable
  • 2m USB2.0 Cable
  • 2m ST-4 Cable
  • M28.5-CS Adapter
  • 1.25" Extender
  • Quick Guide


Sensor 1/3″ CMOS AR0130CS(Color)
Resolution 1.2Mega Pixels 1280×960
Pixel Size 3.75µm
Exposure Range 64µs-1000s
ROI Supported
ST4 Guider Port Yes
Focus Distance to Sensor 8.5mm
Shutter Type Rolling Shutter
Protect window AR coated window
Operating System Compatibility Mac, Windows, Linux
Interface USB2.0
Bit rate 12bit output(12bit ADC)
Adaptor 1.25″ / M28.5X0.6
Dimension φ36mm X 61mm
Weight 60g or 3.1 ounces (without lens)
Working Temperature -5°C—45°C
Storage Temperature -20°C—60°C
Working Relative Humidity 20%—80%
Storage Relative Humidity 20%—95%

Supported Resolutions:

Binning 1×1:

  • 1280X960@35FPS
  • 1280X720@46FPS
  • 1024X768@54FPS
  • 800X600@90FPS
  • 640X480@118FPS
  • 320X240@224FPS

Binning 2×2:

  • 640X480@35FPS

Additional resolutions can be user defined.

Downloads / Manuals

The following manuals and downloads are available for this product:


ZWO ASI Camera User Manuals


ZWO Software and Drivers


Customer reviews

Average Rating (3 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
ASI 120 mini
Wednesday, 4 November 2020  | 

Great product and rapid service.

Rating (max 5):  
Super Sensitive and really easy to use
Wednesday, 22 July 2020  | 

I bought this to use specifically as a guide cam - choosing mono over colour because of greater sensitivity and smaller size.

I hooked this up to one of those cheaper generic chinese 60mm refractors. and popped it onto the top of my 200pds.

The supplied USB cable is suitable long and reaches my laptop with ease. I'm currently using ST4 guiding (don't judge me too harshly) as it's an easy setup for my current mount.

The camera is easy to install. After downloading the drivers, you are immediately ready to go. PHD2 just works with it. It finds an excellent choice of stars to guide lock on to and sometime you can even see your DSO target in the loop. The camera is will made and packaged, it feels solid and reliable. I wasn't planning to use it for planets - but I think I will give it a go. I want to compare it to my cheapy webcam and I'm keen to see how much detail it will bring out.

Other than that, there's not much to say. The camera does exactly what I wanted, with zero hassle. Also I love the red paint!

Rating (max 5):  
Guide cam
Thursday, 15 August 2019  | 

Needed to buy this mini to use with the new ASIAIR as the standard zw120 is not compatable


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