1
Keep the 11 mm T2 ring fitted
The camera measures 6.5 mm from its bare mounting face to the sensor. With the ring installed, that becomes 17.5 mm.
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ZWO
ZWO ASI294MC Pro Cooled Colour CMOS Camera
$1,599.00
One-shot colour for long-exposure deep-sky imaging
The ASI294MC Pro pairs a back-illuminated Sony IMX294 colour sensor with regulated cooling. Each exposure records colour through the sensor’s built-in filter array, so you can build a colour image of a nebula or galaxy in one capture sequence.
4/3″11.7 MP colour sensor
Check the frame against your telescope
The 19.2 × 13.0 mm imaging area sets the field of view for a given focal length. Use the 4.63 µm pixel pitch when working out how finely your setup samples the sky.
63.7 ke⁻full well capacity
Leave headroom for brighter stars
A deeper pixel well holds more signal before it fills. ZWO rates the camera at up to about 13 stops of dynamic range, depending on gain.
120HCG threshold
Read noise steps down at gain 120
High conversion gain switches on automatically at this setting. It’s a useful point to compare with lower gain, where the pixels have more capacity before they saturate.
Hold the sensor at a steady temperature
Regulated two-stage thermoelectric cooling reduces dark current in long exposures. Pick a setpoint the camera can sustain so you can capture lights and calibration darks at the same sensor temperature.
- Cooling below ambient30–35 °C at 30 °C ambient
- Power inputExternal 12 V DC
Available cooling varies with ambient temperature and how long the cooler has been running.
Sensor performance and connections
See what changes at gain 120
ZWO’s colour-model plots show the gain trade-off and how the three colour channels respond to different wavelengths.
Full well
The charge a pixel can hold before saturation. It starts near 63,700 electrons and decreases as gain increases.
Conversion gain
The electrons represented by one digital count. ZWO marks approximately one electron per count at gain 117.
Dynamic range
The span between the noise floor and saturation. It rises back to around 13 stops at the gain 120 transition.
Read noise
Noise introduced when the sensor is read. At gain 120, the plotted read noise drops to around 2 electrons RMS.
Relative spectral response
The red, green and blue traces are scaled to their peak. The green trace is strongest around 530 nm, while the red trace is strongest at longer visible wavelengths.
What the ASI294MC Pro needs to connect
Optical fit
M42 × 0.75 (T2), with 1.25″ and 2″ connection options. Match the fitting to your telescope or corrector. A compatible Nikon or Canon lens requires the appropriate separate adapter.
Capture USB
USB 3.0 to the capture device. The camera also supports USB 2.0 and has a 256 MB DDR3 buffer for image transfers.
External power
12 V DC, 5.5 × 2.1 mm, centre positive. Use a separate supply rated for 3–5 A, including when imaging with cooling switched off. The cooler draws up to 3 A.
Set up a 55 mm optical train
Use this stack when your reducer or flattener calls for 55 mm from its rear reference surface to the sensor.
ZWO shows a second route with a separate off-axis guider. Full-size 55 mm diagram
2
Add the 21 mm T2 extender
Fit the supplied 21 mm section ahead of the camera.
3
Finish with the 16.5 mm extender
The supplied 16.5 mm section brings the total to 55 mm. Use the supplied M42–M48 adapter when the thread on the optics calls for it.
In the box
Camera with fitted 11 mm T2 ring1
Camera bag, cover and quick guide1 each
1.25″ nosepiece1
USB 3.0 cable, 2 m1
USB 2.0 accessory cables, 0.5 m2
16.5 mm T2–M48 and 21 mm T2 extenders1 each
M42–M48 and T2–1.25″ adapters1 each
Fine spacers (0.1, 0.2, 0.2 and 0.5 mm)4
Good to know
Bit depth changes the frame rate
At full resolution over USB 3.0, ZWO lists up to 16 fps in 14-bit mode and 19 fps in 12-bit high-speed mode.
The protective window is AR-coated
The 32 mm window transmits into the near infrared. Factor that into your filter choice.
This is the 11.7 MP colour model
The unlocked higher-resolution mode described for the ASI294MM Pro is exclusive to the monochrome model.
Specifications
Sensor and capture
Sensor
Sony IMX294 back-illuminated colour CMOS
Format and imaging area
4/3″ · 19.2 × 13.0 mm · 23.2 mm diagonal
Resolution
11.7 MP · 4144 × 2822
Pixel size
4.63 µm
ADC and full-frame rate
14 bit up to 16 fps · 12 bit up to 19 fps (USB 3.0)
Full well capacity
63.7 ke⁻
Dynamic range
Up to about 13 stops, gain-dependent
Minimum read noise
1.2 e⁻
High conversion gain
Automatic from gain 120
Estimated peak QE
Approximately 75%
Exposure range
32 µs to 2,000 s
Shutter
Rolling shutter
Cooling and connections
Cooling
Regulated two-stage TEC
Cooling below ambient
30–35 °C at 30 °C ambient
External power input
12 V DC · 5.5 × 2.1 mm · centre positive
Maximum cooling current
3 A
Data interface and hub
USB 3.0 (USB 2.0 compatible) · 2 × USB 2.0 accessory ports
Buffer
256 MB DDR3
Optical connection
M42 × 0.75 · 1.25″ or 2″ with applicable fitting
Camera back focus
6.5 mm bare · 17.5 mm with 11 mm T2 ring
Protective window
AR-coated · Ø32 mm × 2 mm
Body diameter
78 mm
Camera weight
410 g
Supported operating systems
Windows, Linux and macOS
Operating environment
−5 to 50 °C · 20–80% RH
Storage environment
−20 to 60 °C · 20–95% RH
Battery supply range
11–14 V DC
Store locator
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One-shot colour for long-exposure deep-sky imaging
The ASI294MC Pro pairs a back-illuminated Sony IMX294 colour sensor with regulated cooling. Each exposure records colour through the sensor’s built-in filter array, so you can build a colour image of a nebula or galaxy in one capture sequence.
4/3″11.7 MP colour sensor
Check the frame against your telescope
The 19.2 × 13.0 mm imaging area sets the field of view for a given focal length. Use the 4.63 µm pixel pitch when working out how finely your setup samples the sky.
63.7 ke⁻full well capacity
Leave headroom for brighter stars
A deeper pixel well holds more signal before it fills. ZWO rates the camera at up to about 13 stops of dynamic range, depending on gain.
120HCG threshold
Read noise steps down at gain 120
High conversion gain switches on automatically at this setting. It’s a useful point to compare with lower gain, where the pixels have more capacity before they saturate.
Hold the sensor at a steady temperature
Regulated two-stage thermoelectric cooling reduces dark current in long exposures. Pick a setpoint the camera can sustain so you can capture lights and calibration darks at the same sensor temperature.
- Cooling below ambient30–35 °C at 30 °C ambient
- Power inputExternal 12 V DC
Available cooling varies with ambient temperature and how long the cooler has been running.
Sensor performance and connections
See what changes at gain 120
ZWO’s colour-model plots show the gain trade-off and how the three colour channels respond to different wavelengths.
Full well
The charge a pixel can hold before saturation. It starts near 63,700 electrons and decreases as gain increases.
Conversion gain
The electrons represented by one digital count. ZWO marks approximately one electron per count at gain 117.
Dynamic range
The span between the noise floor and saturation. It rises back to around 13 stops at the gain 120 transition.
Read noise
Noise introduced when the sensor is read. At gain 120, the plotted read noise drops to around 2 electrons RMS.
Relative spectral response
The red, green and blue traces are scaled to their peak. The green trace is strongest around 530 nm, while the red trace is strongest at longer visible wavelengths.
What the ASI294MC Pro needs to connect
Optical fit
M42 × 0.75 (T2), with 1.25″ and 2″ connection options. Match the fitting to your telescope or corrector. A compatible Nikon or Canon lens requires the appropriate separate adapter.
Capture USB
USB 3.0 to the capture device. The camera also supports USB 2.0 and has a 256 MB DDR3 buffer for image transfers.
External power
12 V DC, 5.5 × 2.1 mm, centre positive. Use a separate supply rated for 3–5 A, including when imaging with cooling switched off. The cooler draws up to 3 A.
Set up a 55 mm optical train
Use this stack when your reducer or flattener calls for 55 mm from its rear reference surface to the sensor.
ZWO shows a second route with a separate off-axis guider. Full-size 55 mm diagram
1
Keep the 11 mm T2 ring fitted
The camera measures 6.5 mm from its bare mounting face to the sensor. With the ring installed, that becomes 17.5 mm.
2
Add the 21 mm T2 extender
Fit the supplied 21 mm section ahead of the camera.
3
Finish with the 16.5 mm extender
The supplied 16.5 mm section brings the total to 55 mm. Use the supplied M42–M48 adapter when the thread on the optics calls for it.
In the box
Camera with fitted 11 mm T2 ring1
Camera bag, cover and quick guide1 each
1.25″ nosepiece1
USB 3.0 cable, 2 m1
USB 2.0 accessory cables, 0.5 m2
16.5 mm T2–M48 and 21 mm T2 extenders1 each
M42–M48 and T2–1.25″ adapters1 each
Fine spacers (0.1, 0.2, 0.2 and 0.5 mm)4
Good to know
Bit depth changes the frame rate
At full resolution over USB 3.0, ZWO lists up to 16 fps in 14-bit mode and 19 fps in 12-bit high-speed mode.
The protective window is AR-coated
The 32 mm window transmits into the near infrared. Factor that into your filter choice.
This is the 11.7 MP colour model
The unlocked higher-resolution mode described for the ASI294MM Pro is exclusive to the monochrome model.
Specifications
Sensor and capture
Sensor
Sony IMX294 back-illuminated colour CMOS
Format and imaging area
4/3″ · 19.2 × 13.0 mm · 23.2 mm diagonal
Resolution
11.7 MP · 4144 × 2822
Pixel size
4.63 µm
ADC and full-frame rate
14 bit up to 16 fps · 12 bit up to 19 fps (USB 3.0)
Full well capacity
63.7 ke⁻
Dynamic range
Up to about 13 stops, gain-dependent
Minimum read noise
1.2 e⁻
High conversion gain
Automatic from gain 120
Estimated peak QE
Approximately 75%
Exposure range
32 µs to 2,000 s
Shutter
Rolling shutter
Cooling and connections
Cooling
Regulated two-stage TEC
Cooling below ambient
30–35 °C at 30 °C ambient
External power input
12 V DC · 5.5 × 2.1 mm · centre positive
Maximum cooling current
3 A
Data interface and hub
USB 3.0 (USB 2.0 compatible) · 2 × USB 2.0 accessory ports
Buffer
256 MB DDR3
Optical connection
M42 × 0.75 · 1.25″ or 2″ with applicable fitting
Camera back focus
6.5 mm bare · 17.5 mm with 11 mm T2 ring
Protective window
AR-coated · Ø32 mm × 2 mm
Body diameter
78 mm
Camera weight
410 g
Supported operating systems
Windows, Linux and macOS
Operating environment
−5 to 50 °C · 20–80% RH
Storage environment
−20 to 60 °C · 20–95% RH
Battery supply range
11–14 V DC
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