ZWO ASI290MM Mini USB Guide Camera

SKU: ASI290MINI Categories: , ,

The ASI 290 MM Monochrome USB  Guide Camera offers you very good performance for planetary imaging as well as for guiding. Low read noise, high dynamic range, AR protective window and much more are just some of the key characteristics that set it apart from the competition.


Guide Camera Mini Series

A guide camera uses software to assist in control the telescope motors to keep track of a guide star to keep the telescope aligned. (For telescope mount systems with compatible motorised tracking available)


Key features:

  • Colour or Monochromatic: Monochrome
  • Fan Cooled: No
  • Sensor Model: Sony IMX290, CMOS
  • Sensor Size: 1/3 Inch (5.6 mm x 3.2 mm)
  • Resolution: 1936 x 1096
  • Megapixel: 2.1
  • Pixel Size: 2.9 micrometers (µm)
  • Max Analogue to Digital Converter Resolution: 12 bit


$479.00 inc GST

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The ASI290MM Guide Camera is the mini version which has the ability to fit / connect to different types of equipment such as guide scopes and Off Axis Guiders.

The ASI290MM Mini is designed for precise guiding. The 2.9um pixel size gives you a higher arcsec/pixel than the ASI224 or ASI120 camera. This means that, in the same guide scope, the ASI290MM Mini can detect movement of stars to a higher degree than the other cameras. ASI290MM Mini will improve your guiding precision with around 30% compared to the ASI120MM Mini.


How to choose a good guide camera?


The camera size, stability and ease-of-use as well as its ability to fit with different types of equipment eg; guide scopes, OAG etc.

The most important traits. Let’s face it, when you set up your equipment for a night of imaging, you just want things to work and to see that smooth graph on your guiding software before you start your imaging sequence.

In order to do that, there are some things to consider (apart from the points mentioned above):

  • Sensitivity – Sensitivity is the first thing to consider. This is the crucial ability when looking for a star to guide on, so from the beginning ZWO were set on using monochrome sensors to design their guide cameras.
  • Precise guiding – detect movement of stars to a higher degree than the other cameras.
  • Big FOV (field of view) – This is very useful when looking for a star to guide on, using an OAG. When you use an OAG-guider with a Ritchey-Chretien or Schmit-Cassegrain telescope, the hardest part is to find a suitable guide star.


It is not recommended for primarily deep space photography, AOC suggest a fan cooled model for all deep space object long exposure photography.




Sensor: CMOS IMX290/IMX291
Resolution: 1936×1096
MegaPixels: 2.1 Mega Pixels
Pixel Size: 2.9µm
Exposure Range: 32µs-2000s
ROI: Supported
Non-volatile memory/On camera storage: Build-in total 192K byte user-accessible space(image size up to 480X320)
Interface: USB3.0 / USB2.0
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″ / M28.5 X 0.6
Dimension: φ36mm X 61mm
Weight: 60g or 3.1 ounces (without lens)
Working Temperature:  -5°C—45°C
Storage Temperature:  -20°C—60°C
Working Relative Humidity:  20% — 80%
Storage Relative Humidity:  20% — 95%
Supported resolution – Binning 1×1: 1936 × 1096 @ 20.4 FPS
1280 × 960 @ 35.3 FPS
640 × 480 @ 141.5 FPS
320 × 240 @ 355.9 FPS
Supported resolution – Binning 2×2: 968 × 548 @ 20.4 FPS