Astronomy Specialist



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The ZWO ASI 294MM PRO is a highly versatile monochrome cooled camera with a large sensor which is ideal for wide field astrophotography. This new mono version of the ASI294 features the Sony IMX492 back-illuminated sensor which is natively binned 2x2 to give 4.63 µm pixels, ideal for long focal length telescopes, but can be unbinned to give small 2.3 µm pixels for wide focal length scopes such as refractors.

ZWO ASI294MM Pro CMOS cooled deep sky camera specifications


The ASI294MM Pro has an outstanding QE value with a peak of 90%, ultra-low read noise of 1.2e- and full well capacity of 66,387e-. The camera has a 14-bit ADC with a high dynamic range of 13 stops, higher than the popular ASI1600MM Pro.

When the gain value is set to 120, HCG high gain mode is turned on. In this mode the readout noise will be largely decreased (as low as 1.2e), and the dynamic range is basically unchanged.


ZWO ASI294MM Pro CMOS cooled deep sky camera read noise, full well, dynamic range, dark currentBin2 (The default mode): 14bit ADC, 4.6um pixel size, 11.7 megapixels, 4144*2822 resolution, 66k full well capacity.


ZWO ASI294MM Pro CMOS cooled deep sky camera unlocked read noise, full well, dynamic range, dark current

Unlocked Bin1: 12bit ADC, 2.3um pixel size, 47 megapixels, 8288*5644 resolution, 14k full well capacity.

The USB 3.0 Port provides 5Gbps bandwidth and lets the camera run at 16.3fps at full resolution (11.7 Megapixel). 

The USB 2.0 Hub allows to connect 2 USB controlled accessories such as a filter wheel, a guiding camera or an electronic focuser, reducing the amount of cables that run directly from your computer.

The 2 stages TEC cooling system allows a ΔT of 35°C-40°C below air temperature. The cooling system requires an external power supply of 12V at 3-5A with a 2.1×5.5mm connector (positive tip). The ASI 294MM can be powered with a standard lead battery or a DC source between 9-15V.


ZWO ASI294MM Pro cooled mono CMOS deep sky astronomy camera quantum efficiency


4/3″ SONY IMX492 CMOS - monochrome


11.7 Megapixels 4144 x 2822, 47 Megapixels 8288 x 5644

Pixel size

4.63 µm, 2.3 µm in Unlocked Bin1 mode

Sensor size

19.1 mm x 13.0 mm (23.1 mm diagonal)

Quantum efficiency

90% peak

Exposure range


Read noise

1.2 ~8 e (@ 30 dB)

Full Well Capacity

66,387 e-

Bit rate



16.3 fps

Shutter type

Rolling shutter


ΔT of 35°C-40°C

Memory Buffer





Mac, Windows, Linux

Protecting window

D32-2-AR coated


USB 3.0 / USB 2.0

Back focus

6.5 mm


2" / 1.25" / M42 x 0.75


Ø 78 mm; ↨ 77.5 mm


410 gr

Power supply

9-15V 3 A  (2.1×5.5 mm  connector)



ZWO ASI294MM Pro deep sky cooled mono CMOS astronomy camera schematics ZWO ASI 294MC PRO [COLOUR]

1. M43-T2 adapter

2. EOS-T2 adapter

3. 2”Filter (optional)

4. 1.25” T-Mount

5. 1.25” Filter (optional)

6. M42-1.25” adapter (optional)

7. T2 extender 11mm

  • Camera bag
  • Camera body
  • USB 3.0 cable (2 metres)
  • 21mm extender (M42 male - M42 female)
  • 16.5mm extender (M48 female - M42 male)
  • 11mm M42 female extender (screwed to the camera) 
  • Nose piece (M42 male to 1.25" female)
  • Internal adapter M42 (female) to M48 (male)
  • 2x USB 2.0 cables 0.5m
  • M42 male to 1.25" filter thread (necessary to connect a 1.25" filter inside the 11mm extender)
  • 0.3mm spacer
  • 0.5mm spacer
  • User manual
  • 1.25mm plastic cap
  • Plastic cap for 11mm M42 extender


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