ZWO ASI 290MM Mini USB 2.0 Mono Camera
 ZWO ASI 290MM Mini USB 2.0 Mono CameraZWO ASI 290MM Mini USB 2.0 Mono Camera 

ZWO ASI 290MM Mini USB 2.0 Mono Camera

  (9 Reviews)
✓ 2 year warranty


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About this product

Model:  zwo_asi290mm_mini
Part Number:  ASI290MINI

Compatible with the new ZWO ASiair smiley

The ZWO ASI290MM/MC features the new 1.28" 2.13Mp Sony IMX290LQR / IMX291LQR back-Illuminated CMOS sensors with 2.9 µm pixels. 

Improved visible light and near-Infrared sensitivity. 

Supports Full HD 1080p

Anti-reflective (AR) optical window.

ZWO Mini Camera Body

Compared to the standard ASI290MM camera the ASI290MM Mini is considerably smaller and lighter enabling it to fit directly into a 1.25" focuser so it can reach focus with an eyepiece positioned at the same position. 

All ZWO cameras include a 2-year warranty. 

Not recommended for use in Linux

Camera Field of View Simulator

Astrophotography Performance

The ASI290MM Mini camera offers great planetary imaging and guiding performance with low read noise, high dynamic range, QE peak >80% and an AR protective window.

290MM vs 290MM Mini

Compared to the standard ASI290MM camera the ASI290MM Mini is significantly smaller and lighter.

USB2.0 Port & ST4 Port

USB2.0 Port: Mini cameras have one USB2.0 type C port. Type C port is very popular among mobile phones, it doesn't matter which way up it is inserted.

ST4 Port: Can connect the camera directly to the auto guide port of the mount.

Connection Drawing

Mechanical Drawing



What's in the box

  • ASI290MM Mini Camera
  • 1.25" Cap
  • M28.5-CS Adapter
  • 1.25" Extender
  • 2-metre USB 2.0 Cable
  • 0.5-metre USB 2.0 Cable
  • 2-metre ST-4 Cable
  • Quick Start Guide
  • Driver CD


Sensor 1/2.8″ CMOS IMX290/IMX291
Resolution 2.1Mega Pixels 1936×1096
Pixel Size 2.9µm
Exposure Range 32µs-2000s
ROI Supported
ST4 Guider Port Yes
Focus Distance to Sensor 8.5mm
Shutter Type Rolling Shutter
Protect window AR coated window
Operating System Compatibility Mac, Windows, Linux
Interface USB2.0
Bit rate 12bit output(12bit ADC)
Adaptor 1.25″ / M28.5x0.6
Dimension φ36mm X 61mm
Weight 60g
Working Temperature -5°C—45°C
Storage Temperature -20°C—60°C
Working Relative Humidity 20%—80%
Storage Relative Humidity 20%—95%


Supported Resolutions:



  • 1936×1096: 20.4
  • 1280×960: 35.3
  • 640×480: 141.5
  • 320×240: 355.9
  • 2X2Bin :968×548: 20.4

Additional resolutions can be user defined.

Downloads / Manuals

The following manuals and downloads are available for this product:


ZWO Software and Drivers


Customer reviews

Average Rating (9 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Lovely little camera!
19 February 2023  | 

This camera is great! I bought it originally for guiding but i have even used it for some imaging (before my main imaging camera arrived).
It works really well both in the ZWO OAG-L and on a separate guiding scope.

Rating (max 5):  
Linux works ok
05 April 2022  | 

using it fine with ekos/indi etc

Rating (max 5):  
ZWO ASI 290MM Mini
22 February 2022  | 

Looked for another mono camera for guiding having swapped my other onto another rig
Wanted to save some money and put it towards a higher quality main camera so plumped for middle of the range ... 290MM mini
Have read the specs and reviews and the 290 mini scaled well with my guide scope.
I have only been able to test it out for just shy of 2 hours before the clouds, rain then winds came (still far too windy for proper trials)
It did however perform very well in that short period - I was imaging in the same area to get a comparison and this camera definitely picked up on a lot more stars and sharper to-boot
It did give a better 'shape' for HDR / HDF profile and did give a better guiding with comparable seeing when using the 120MM mini
The promoted figure of 30%, thereabouts, better than the 120 mini, so far, seems to be very true
A good guiding camera in my view .... Thanks FLO for a quick delivery, well packaged.

Rating (max 5):  
Fantastic Guide Camera
14 February 2022  | 

Iíve now upgraded both my 120mm Mini Guide Cameras to the 290mm MiniÖ Itís smaller pixel size and improved sensor allows guide stars to be detected with ease, I rarely get any interruptions with guiding with this camera and through a 50mm guide scope get 0.3-0.5 arc sec accuracy on both my rigs. Canít recommend it enough, itís expensive compared to the 120mm Mini but well worth the investment.

Rating (max 5):  
Using as a guide camera
03 February 2022  | 

Perfect for the task lightweight and very sensitive

Rating (max 5):  
ZWO ASI 290MM Mini USB 2.0 Mono Camera
30 June 2021  | 

Perfect guiding camera , excellent service as always.

Rating (max 5):  
25 September 2020  | 

This has been a great upgrade from my ASI120-S, I'm experiencing lower noise, higher resolution - giving better star detection in guiding, coupled with the Helical focuser on my ZWO OAG it has allowed me to half the exposure time I need to get stable guiding.

Rating (max 5):  
ASI290mm mini
05 December 2019  | 

Previous guidecam was the ASI120mm usb2. This is a significant upgrade. Smaller and lighter, and more sensitive. Gives me a smaller pixel scale and hence better guiding, the increased sensitivity means I have a choice of many more guide stars. Finally unlike the 120 it plays nicely with the USB2 hub on the back of my 294MC Pro, so simpler wiring. Is sensitive enough that it will work well if I ever decide to move from guidescope to OAG. Currently using it with the ZWO guidescope (280mm) which it suits well.

Rating (max 5):  
AS!290mm Mini Review
19 April 2018  | 

I used this for the first-time last night along with my new ZWO OAG. Having had an Altair Astro GPCAM previously, I wanted something with better sensitivity to pick off guide stars with my F5.8 TSQ100ED as the GPCAM sometimes struggled with just a separate F4 guide scope. When I fired up PHD for the first time I was amazed at the number of stars available in the FOV all with great SNR. As I was only really testing my setup I tried it in a few different locations and not once did I have to move the scope to find a suitable guide star. This is a fantastic, very sensitive, little guide camera and worth every penny in my view.


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