ZWO ASI120MM Mini USB Guide Camera

SKU: ASI120MINI Categories: , ,

The ASI 120 MM Monochrome USB  Guide Camera offers a very good performance for planetary imaging as well as for guiding. Low read noise, high dynamic range, AR protective window and much more are just some of the key characteristics that set it apart from the competition.


Guide Camera Mini Series

A guide camera uses software to assist in control the telescope motors to keep track of a guide star to keep the telescope aligned. (For telescope mount systems with compatible motorised tracking available)


Key features:

  • Colour or Monochromatic: Monochrome
  • Fan Cooled: No
  • Sensor Model: ARO130CS, CMOS
  • Sensor Size: 1/3 Inch
  • Resolution: 1280 x 960
  • Megapixel: 1.2
  • Pixel Size: 3.75 micrometers (µm)
  • Max Analogue to Digital Converter Resolution: 12 bit


Due late November 2022


$249.00 inc GST

Available Now

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The ASI120MM Guide Camera is the mini version which has the ability to fit / connect to different types of equipment such as guide scopes and Off Axis Guiders..


How to choose a good guide camera?


The camera size, stability and ease-of-use as well as its ability to fit with different types of equipment eg; guide scopes, OAG etc.

The most important traits. Let’s face it, when you set up your equipment for a night of imaging, you just want things to work and to see that smooth graph on your guiding software before you start your imaging sequence.

In order to do that, there are some things to consider (apart from the points mentioned above):

  • Sensitivity – Sensitivity is the first thing to consider. This is the crucial ability when looking for a star to guide on, so from the beginning ZWO were set on using monochrome sensors to design their guide cameras.
  • Precise guiding – detect movement of stars to a higher degree than the other cameras.
  • Big FOV (field of view) – This is very useful when looking for a star to guide on, using an OAG. When you use an OAG-guider with a Ritchey-Chretien or Schmit-Cassegrain telescope, the hardest part is to find a suitable guide star.


It is not recommended for primarily deep space photography, AOC suggest a fan cooled model for all deep space object long exposure photography.



Sensor: 1/3″ CMOS AR0130CS (Mono)
Resolution: 1280 × 960
MegaPixels: 1.2 Mega Pixels
Pixel Size: 3.75 µm
Exposure Range: 64µs – 2000s
ROI: Supported
Non-volatile memory/On camera storage: Build-in total 192K byte user-accessible space(image size up to 480X320)
Interface: USB3.0 / USB2.0
ST4 Guider Port: Yes
Focus Distance to Sensor: 8.5mm
Shutter Type: Rolling Shutter
Protect window: Protect window: AR coated window
Operating System Compatibility: Mac, Windows, Linux
Interface:  USB2.0
Bit rate:  12bit output
Adaptor:  1.25″ / M28.5 X 0.6
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 resolution – Binning 1×1: 1280 X 960 @35FPS
1280 X 720 @46FPS
1024 X 768 @54FPS
800  X 600 @90FPS
640  X 480 @118FPS
320  X 240 @224FPS
Supported resolution – Binning 2×2: 640  X 480 @35FP