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ZWO ASI120MM-S Monochrome CMOS Astrophotography Camera

Brand: ZWO


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  • Perfect choice for lunar and planetary imaging!
  • Its CMOS sensor is sensitive enough to capture bright deep-sky objects.
  • 1280 x 960 and 3.5-micron square pixels.
  • Peak Quantum Efficiency is 75%.
  • Ultra-fast download speeds up to 254 frames per second.
  • 60 frames per second at full resolution.

Product Details

  • The ZWO ASI120MM-S Super Speed Camera is a perfect choice for lunar and planetary astrophotography! It features a CMOS sensor, sensitive enough to capture bright deep-sky objects. An ideal choice for the serious beginner or intermediate astrophotographer.

    The ZWO ASI120MM-S Specs at a Glance

    Experience the ZWO ASI120MM-S Monochrome Camera

    Accelerated Performance

    Switch from planetary to deep space imaging without having to weigh down your set up. The ZWO ASI120MM produces frames with 254 per second with reduced resolution or 60 frames per second at full resolution.Download your images at lightning speed with the USB 3.0 connection.

    Optimum Design

    Encamped in a vibrant, metallic red aluminum housing andwith both a USB and ST4 autoguider port, the ZWO ASI120MM-S is convenient and versatile. Easily attach a wide variety of camera mounts and tripods with its one-fourth-inch-20 threadin the center bottom of the camera or any of its four M4 threads along the outside edge.

    Prioritized Mechanics

    • Built on a one-third inch CMOS AR0130S monochrome sensor. Spectacular details are revealed in high-resolution black and white. Pair with a filter wheel to capture each color or narrowband and stack images as you choose. 
    • The pixel array of 1280 x 960 and a pixel size of 3.75-micron square make this camera capable of capturing moderately wide fields when used with the included 150-degree wide-angle lens adapter.
    • Peak QE is 75% with absolutely no fixed pattern noise. Protecting the sensor is an IR-cut window.

     OPT Product Number: ZWO-ASI120MM-S


  • specifications

    ADC12 bit
    Back Focus12.5 mm
    Camera ConnectionFemale M42x0.75
    Color or MonoMonochrome
    Dynamic Range11.6 Stops
    Free ShippingYes
    Full Rez Frame Rate60fps
    Full Well20ke
    Max Frame Rate254fps
    Mega Pixels1.2 mp
    Peak QE78%
    Pixel Array1280 x 960
    Pixel Size3.75 microns
    Read Noise6.6e
    Sensor Diagonal6 mm
    Sensor TypeCMOS
    SensorOn Semi AR0130CS
    Weight0.2 lbs
  • included items

    • ZWO ASI120MM-S Monochrome 1.2 Mega Pixel Astronomy Camera.
    • 150-degree Lens Adapter for use as an all-sky camera.
    • M42 to 1.25-inch nosepiece.
    • 1.25-inch IR-cut window.
    • 2 m long USB cable.
    • 2 m long ST4 guider cable.
    • Driver and Extra Software CD.

Product Reviews

Customer Reviews
4.5 Based on 18 Reviews
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Allen G.
United States United States

Zwo issues

This purchase is to replace my previous 120mono. The usb connection failed and I couldn’t find a replacement. I Also have a Zwo294mcPro, which started reading exposure failure and stopped working. After numerous contacts and wrong info from Zwo, they finally admitted it was broken. I shipped it to the dealer and was informed theCamera needs to be shipped to China for repair and it will take between six months to a year to return! So much for Zwo warrentee and repair services! I would think twice and find a company that services their product here! N

OPT Telescopes ZWO ASI120MM-S Monochrome CMOS Astrophotography Camera ReviewOPT Telescopes ZWO ASI120MM-S Monochrome CMOS Astrophotography Camera Review
United States United States


camera works just like I needed it to for autoguiding my avx mount and asi294mc pro camera using asi air pro controller. The delivery was fast.

Andrew W.
United States United States

Limited use so far

I was very impressed with the little zwo. I bought it to use as a guide camera, but since my mount has not arrived yet, I decided to get familiar with it anyway. It seems to be a very sensitive and well designed camera. If my local weather will cooperate, I will soon be trying for Mars, as it is ideally positioned about midnight right out my front door.

Tyler B.
United States United States

Great guide scope

I love this for a guide scope it’s perfect and light weight. Makes a great addition to the imaging train.

Allen F.
United States United States

Review: A good set of results for Half Venus, Orion Nebula, Moon.

A good set of results for Half Venus, Orion Nebula, Moon.

New Zealand New Zealand

Unfortunate circumstances

I had placed an order for a sky guider pro and accessories as well as a ZWO planetary camera. I ended up only getting the zwo due to the long wait time of the back ordered skyguider but your team where very professional and extremely helpful. Christian was great. I consider myself to be a very difficult customer this time around but your team especially Christian was great so thank you for that!