ZWO ASI120MM Mini Monochrome CMOS Camera

  • Its Powerful Performance Makes it Great for Guiding!
  • Peak QE of Over 75%!
  • Pixel Array: 1280 x 960.
  • Pixel Size: 5.86 microns.
  • Read Noise: 3.5e.
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  • Regular price $149.00

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ZWO ASI120MM Mini Monochrome CMOS Camera

The ZWO ASI120MM Mini is a top-notch monochrome guide camera, well-suited for both planetary imaging and acting as a guider to amplify the usefulness of other astronomy instruments. Despite being qualified as a 'miniature' camera, it still operates at a high level of performance; with a peak QE over 75%, a typical read noise of only 4.0e, a pixel array of 1280 x 960, and a pixel size of only 3.75 micrometers, it qualifies as a powerhouse despite its small size. It achieves all of this while presenting a small and slender profile, taking up a minimum of space in your imaging train. The interface for this camera is a Type C USB 2.0 port, similar to that found in several mobile phone types.

The ZWO ASI120 Mini Specifications at a Glance

Capture Deep-Sky and Planetary Images with the Features of the ZWO ASI120 Mini 

Powerful Astrophotography Performance

Engineered with high sensitivity, precise guiding, and a peak value at over 75%, the ASI120 Mini has an incredible light-gathering ability helping you produce breathtaking images!

Accessible Mechanics

This ZWO Mini camera has one USB 2.0 type C port which is very popular among mobile phones. It can also connect to the auto guide port of a mount providing convenience and versatility!



ADC12 bit
Back Focus8.5 mm
Camera Connection1.25" Nosepiece & M28.5x0.6
Color or MonoMonochrome
Delta TC
Dynamic Range11.2 Stops
Free ShippingYes
Full Rez Frame Rate35fps
Full Well14.5ke
Max Frame Rate224fps
Mega Pixels1.2 mp
MPLess than 2 MP
Peak QE75%
Pixel Array1280 x 960
Pixel Size3.75 microns
PS3 Microns or Smaller
Read Noise6.4e
Sensor Diagonal6 mm
Sensor TypeCMOS
SensorOn Semi AR0130CS
Weight0.992 lbs


Customer Reviews
4.4 Based on 18 Reviews
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  • QHY5L-II
Mexico Mexico
Very good camera very good service

I ever buy my astronomic parts in Opt, it has ever been a very good and fast service, the asi 120 mini is a very good guider i am totally satisfied with this

Christopher F.
United States United States
Excellent Guide Camera

I have been using the ASI120mm for more than two months as a guide camera attached to a Williams Optics 50mm guide scope. It replaced an aging DSI Pro that refused to play nicely with a new Win10 PC. The ASI120mm worked with PHD2 right out of the box without any problems and my guiding has been almost flawless since it arrived. I am very pleased with this camera.

Jacques L.
South Africa
Zwo 120 asi mini

Great little guide camera! And excellent service from Opt! Thanks Opt

A OPT Telescopes Customer
Mitchell T.
United States United States
This saved my guiding efforts

I originally purchased a QHY5L-II guide camera and had issues right away. I spent a few weeks doing everything from parsing event logs and windows crash reports (yes, blue screens!) to formatting and reloading windows on my laptop to get the QHY camera to work. It didn't PHD2 and TheSkyX would crash while using the QHY camera after about 10-30 minutes of use. I had a **** of a time finding stars as well. I returned the QHY Camera for a ZWO 120mm Guide Camera. I Immediately plugged it into my imaging laptop. No need to download drivers, because I have them for the ASI1600MM camera I image with. For 24 hours, I ran the camera in PHD2 in my home office. I never had a single error, glitch or crash in any software. For two weeks now, I've been able to image all night with PHD2 running in the background, guiding happily. If you have an OAG, and need a good camera, this will work. If you already have a ZWO camera and have no stability issues with the software this camera will do everything you need it to do. I am going to knock a star off the review, however, because in my experience this camera can be quite noisy when doing exposures under 1s. Guiding with 2x2 binning and 3s subs however gives amazing SNR for guiding.

Anand V.
United States United States
Excellent Experience

Item was delivered fast and on time.

Maximilian H.
United States United States
Great guide camera

I bought this as a replacement/upgrade from my Orion SSAG, first light with it I noticed my guiding was tremendously better. The sensor is much more sensitive than the SSAG and was able to maintain around 1.26 arcsec/pix the entire night