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ZWO ASI120 Super Speed Monochrome CMOS Telescope Camera

  • The ZWO ASI120MM-S Super Speed camera features a monochrome CMOS sensor and USB 3.0.
  • 1.2MP CMOS sensor has an array of 1280 x 960 and 3.5 micron square pixels. Peak Quantum Efficiency is 75-percent
  • Absolutely no fixed pattern noise!
  • Ultra fast download speeds up to 254 frames per second.
  • 60 frames per second at full resolution.


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  • Regular price $179.00

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ZWO ASI120 Super Speed Monochrome CMOS Telescope Camera

An ultra fast incarnation of its predecessor, the ZWO ASI120S camera has the ability to deliver frames at 254 per second with reduced resolution or 60 frames per second at full resolution (tested without overclocking, with USB 3.0). This wide range of resolution and capture settings allows you to switch from planetary and lunar imaging to DSO's easily without having to weigh down your set up with an additional camera.

Housed in gorgeous metallic red aluminum with both a USB and ST4 autoguider port. Both ports have 6.5-foot cables included, as well as a 2-inch M42x0.75 threaded interface, and a standard M42 to 1.25-inch nosepiece. A 1/4-20 thread in the center bottom of the camera makes for easy attachment to a wide variety of camera mounts and tripods. 4 M4 threads along the outside edge offer additional mounting positions.

With the USB 3.0 connection, image download times are lightning fast.

The ZWO ASI120 Super Speed Monochrome camera is a perfect choice for lunar and planetary imaging. It features a CMOS sensor sensitive enough to capture bright deep-sky objects. Truly a do-it-all camera at an incredible price making it the clear choice for the serious beginning or intermediate astrophotographer.

The ASI120MM-S is built on a 1/3 inch CMOS AR0130S monochrome sensor. Beautiful 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-percent with absolutely no fixed pattern noise. Protecting the sensor is an IR-cut window.


OPT Product Number: ZWO-ASI120MM-S


ADC12 bit
Back focus12.5mm
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
Power Consumption5V 1.5A
Read Noise6.6e
Sensor Diagonal6mm
Sensor TypeCMOS
SensorOn Semiconductor AR0130CS
Weight0.2 lbs




  • 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



Customer Reviews

4.8 Based on 6 Reviews
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richard m.
United States United States

Great camera...

Too bad it doesn’t work on a Mac.



I got this mono camera specifically for guiding on my Orion 60 Guide Scope (240 mm focal length). The camera is fast, sharp, sensitive. If one wants a USB3 capable camera this thing is great for guiding. While hunting for a guide star it readily displayed M53. I am completely happy w/ this ZWO product.

joe p.
United States

asi120 zwo.. NOT COOLLEEDDDDD!!!!

hi i though i was buying a cooled one.. it says cooled!! but it finds out it is just got openins and fins to let chip heat out?

Cesar B.

My new ZWO ASI 290MC camera

I have just tested my new ZWO ASI 290MC camera on my 6 inch Newtonian reflector and it works great. Excellent high frame rate throughput with its USB 3 connection, and excellent sensitivity. I observed Mars, Saturn, Jupiter and the Moon using ASICAP v1.4 running on Linux Ubuntu 18.04. I placed my order with OPT on 08/01 and got it 08/13, here in La Serena, Chile; so just under two weeks, which I consider pretty good for standard international delivery. I am very happy with OPT and with the product.

United States


Indoor testing with FireCapture and learning settings. Have had nothing but cloudy days since I got the camera so haven't had a chance to use on moon or planets yet, but I am sure it will work as expected. Set it up to work on both with my MacBook and PC with no problems. Looking forward to some clear skies.....

Thomas E.
United States

ZWO 120M-S

OK, I think overall this is a good-excellent product especially the USB3 buffered download. However, present CMOS cameras, while very good and inexpensive suffer one major PIA and that is having to cover the scope to get a dark at short focus speeds. If you use MaximDL you end up being a jumping bean even though you have declined darks in the program. These cameras lack of a physical shutter a real negative for ownership. A real plus for this camera, if you use it as a OAG guider is the thing is a pancake in outline. I have three telescopes on the mount 12.5in, 5in, 2in. I have guiders on all three to minimize flex. this camera is a blessing over tall outboard tubular cameras of other manufacture. You will experience less physical interference. This not a rant just a first hand report from last evening. BTW the guiding was flawless less than .5 pix