ZWO ASI290MM Mini CMOS Telescope Guide Camera

  • ZWO ASI290MM Mini is an excellent choice for a guide camera.
  • Doubles as a planetary camera.
  • Pixel Array: 1936 x 1096.
  • Pixel Size: 2.9 Micrometers.
  • Read Noise: 1.0 e.
  • Peak QE: 80%.
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  • Regular price $299.00
  • $269.10
  • You save: $29.90 (10%)

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ZWO ASI290MM Mini CMOS Telescope Guide Camera

The ZWO ASI290MM Mini is a top-notch monochrome guide camera, well suited to 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 80%, a read noise of only 1.0 e, a pixel array of 1936 x 1096, and a pixel size of only 2.9 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. 

ZWO ASI290MM Mini Specifications at a Glance


USB 2.0 Port: Its Type C port is very popular in mobile phones.

ST4 Port: Can connect the mini camera directly to the autoguider port of the mount.


ADC12 bit
Back focus8.5mm
Camera ConnectionM28.5x0.6 / Type C mount
Color or MonoMonochrome
Delta T45°C Below Ambient
Dynamic Range12 Stops
Free ShippingYes
Full Rez Frame Rate20.4fps
Full Well14.6ke
InterfaceUSB 2.0
Max Frame Rate355.9fps
Mega Pixels2.1 mp
Peak QE78%
Pixel Array1936 x 1096
Pixel Size2.9 microns
Power Consumption12V 2A max
QE Peak80%
Read Noise3.1e
Sensor DesignCMOS
Sensor Diagonal6.5mm
Sensor TypeCMOS
SensorSony IMX290
Warranty2 Year Warranty
Weight0.1322 lbs


  • Camera Body.
  • 1.25-inch Cover.
  • User Manual.
  • Software CD ROM.
  • 0.5 m USB 2.0 Cable.
  • 2 m USB 2.0 Cable.
  • ST4 Cable.
  • M28.5-CS Adapter.
  • 1.25-inch Extender.

Customer Reviews

5 Based on 6 Reviews
5 ★
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Thomas M.
United States

Great Guide camera

Love this guide camera, Very light weight extremely sensitive to faint stars, no trouble finding one to guide on. My personal opinion don't think you can find a better one at this price point. OPT great place to order all your stuff, prices are competitive, Very fast shipping.

John E.
United States United States

Superb quality, great for guidescope

ZWO's asi290mm mini is a great product. Generally IM a bit skeptical about stuff from a Eastern based company, but Im more than impressed with build quality, accessories and function. This works flawlessly as a guidescope for an 80mm orion on my 11" rasa. Integrates perfectly with ASIAIR and I have a beautiful tablet controlled astrophoto rig set to autopilot while I visually observe through my other scopes!

Paul L.
United States United States

Improved my guiding!

I went from an Orion SSAG -- which was working without any problems -- to the ASI290MM-mini. First big difference is that the 290 mini is significantly smaller and lighter than the SSAG, making it easier to mount and balance. Second, the image is considerably less noisy and cleaner, making it easier to find useful guide stars. Finally, the smaller pixels (about half the size of the SSAG) result in better guiding performance than I was getting before. All in all it was a really useful upgrade, at a reasonable price, and with the usual great OPT shipping and service. Five stars!

Paul H.
United States

My new best guide camera

The best part of this camera is the mini size. When used in off axis guiding, and with the spacers in front of the image camera, it can be mounted directly in front of the filter wheel. This makes for a compact image train. Although its not cooled, the camera has low noise and good sensitivity. As expected, no issues with finding guide stars with at 910mm focal length. Hoping for as good results at 2000mm FL.

Ross S.
United States

Fast Delivery

I received the camera in perfect condition about 24 hours after placing the order. Of course I'm just 10 miles from the store but I was pleased to see how fast the order got processed.

Christopher O.
United States

awesome camera

this camera works great as a guide cam with the new William Optics 50mm guide scope.