ZWO ASI120MM-S Super Speed Monochrome CMOS Telescope Camera

  • 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.
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  • Regular price $179.00

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ZWO ASI120MM-S Super Speed Monochrome CMOS Telescope Camera

The ZWO ASI120MM-S Super Speed Camera is a perfect choice for lunar and planetary imaging! 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 and with 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 thread in 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



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

4.9 Based on 8 Reviews
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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!

Matthew H.
United States United States

Awesome guide camera, Great service

This was one of those rare occasions when a new gadget I bought for my telescope worked flawlessly the very first time out of the box. Most require some sort of learning curve to overcome or manual to read. Great guiding camera! Service at OPT is also top notch. Super fast shipping. Thanks guys!

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.