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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
ZWO ASI294MM Pro Mono

ZWO ASI294MM Pro Mono

by ZWO
SKU ZWO-ASI294MM-P
$1,280.00 - $1,280.00
$1,280.00
$1,280.00 - $1,280.00
$1,280.00
Price Match Policy!
  • 4/3" Sony BSI CMOS Sensor
  • 11.7 MP Resolution (4144 x 2822) at 4.63µm Pixel Size
  • Unlockable 47 MP High-Resolution Mode at 2.3µm Pixel Size
  • 90% Peak Quantum Efficiency
  • 1.2e Minimum Read Noise
  • Two-Stage TEC Cooling to 40°C Below Ambient
1 in stock
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • ZWO ASI294MM Pro Cooled Monochrome Camera

    The ZWO ASI294MM Pro combines a 4/3" back-illuminated Sony sensor with two distinct imaging modes, delivering both high dynamic range and high-resolution capture in a single camera. Its default 11.7 MP mode uses 4.63µm pixels to achieve a massive 66.4k full well capacity, while an unlockable mode reconfigures the sensor to 47 MP with 2.3µm pixels for maximum detail on smaller targets. With a peak quantum efficiency of 90% and read noise as low as 1.2e, this camera captures faint signal from nebulae and galaxies with exceptional clarity.

    Two Cameras in One: 4.63µm and 2.3µm Pixel Modes

    The ASI294MM Pro's unique sensor architecture gives you two distinct performance profiles. In its standard Bin2 mode, the 4.63µm pixels and 14-bit ADC are optimized for capturing targets with a vast brightness range, like the Orion Nebula (M42), without saturating the core. For smaller targets like the Whirlpool Galaxy (M51) or planetary nebulae, you can switch to the unlocked Bin1 mode. This mode uses the sensor's native 2.3µm pixels for a 47 MP final image, resolving finer details at the trade-off of a lower 14k full well and 12-bit ADC output.

    90% QE and 1.2e Read Noise at -40°C

    Deep-sky imaging relies on capturing every possible photon while introducing minimal noise, and the ASI294MM Pro is engineered for exactly that. The back-illuminated sensor architecture achieves a peak quantum efficiency of ~90%, ensuring the vast majority of incoming light is converted to signal. To keep noise under control during long exposures, the two-stage TEC cooler drops the sensor temperature by up to 40°C below ambient, while the camera's electronics produce a minimum read noise of only 1.2 electrons. This combination keeps the faint, outer structures of galaxies well above the noise floor.

    ASI294MM Pro vs. ASI294MC Pro: Monochrome Sensitivity

    While the color ASI294MC Pro offers the simplicity of single-shot imaging, the ASI294MM Pro provides the raw sensitivity needed for advanced astrophotography. By removing the Bayer filter matrix found on the color sensor, the monochrome version achieves a higher peak QE of ~90% and captures the full resolution of the sensor for every filtered exposure. This makes it the definitive choice for narrowband imaging with Ha, SII, and OIII filters, allowing you to isolate specific nebula emissions with maximum signal strength—something a color camera cannot do with the same efficiency.

    256MB DDR3 Buffer and 16.5 FPS Data Transfer

    To ensure stable, drop-free imaging sessions, ZWO includes a 256MB DDR3 memory buffer. This onboard cache secures image data before it's transferred to your computer, preventing data loss from USB bandwidth interruptions and eliminating the amp glow seen on cameras without this feature. The USB 3.0 interface provides enough bandwidth to transfer full 11.7 MP, 14-bit frames at up to 16.5 FPS, making the camera equally capable for high-speed lunar and solar imaging as it is for long-exposure deep-sky work.

  • What makes the ASI294MM Pro a good deep-sky camera?

    The ZWO ASI294MM Pro is an excellent deep-sky camera due to its combination of high ~90% quantum efficiency, very low 1.2e read noise, and a large 66.4k full well capacity in its default mode. This allows it to capture faint details in nebulae and galaxies with a high signal-to-noise ratio and wide dynamic range.

    What do the Bin1 and Bin2 modes on the ASI294MM Pro mean for imaging?

    These modes offer a trade-off between dynamic range and resolution, effectively giving you two cameras in one.

    • Bin2 Mode (Default): Combines pixels to create larger 4.63µm pixels. This mode gives you a massive 66.4k full well capacity and 14-bit output, perfect for capturing objects with a wide range of brightness levels.
    • Unlocked Bin1 Mode: Uses the sensor's native 2.3µm pixels for a very high 47 MP resolution. This mode is ideal for capturing fine details on smaller targets, but has a smaller 14k full well and 12-bit output.

    How will the ASI294MM Pro perform on the Horsehead Nebula (Barnard 33) with an 80mm f/6 refractor?

    This is an excellent pairing. The 4/3" sensor will frame the Horsehead and Flame Nebula region nicely at the 480mm focal length of that telescope. The camera's high sensitivity, especially its ~90% QE, is critical for capturing the faint hydrogen-alpha signal that defines the Horsehead Nebula against the background emission of IC 434.

    Is the ASI294MM Pro's 4.63µm pixel size a good match for an 8" f/10 SCT for galaxy imaging?

    Yes, it's a very good match. An 8" SCT has a focal length of around 2000mm. With the 4.63µm pixels in Bin2 mode, your image scale will be around 0.48 arcseconds/pixel, which is ideal for sampling fine details in galaxies under good seeing conditions. The large 66.4k full well is also a major advantage for preventing the bright cores of galaxies from saturating during long exposures.

    What power supply is required for the ASI294MM Pro's cooling?

    The two-stage TEC cooler requires an external power source to function. You will need a 12V DC power supply capable of delivering at least 3A. The camera's data transfer can be powered by the USB 3.0 port, but cooling always requires this separate power source.

    How do I achieve the standard 55mm back focus with the ASI294MM Pro?

    The ZWO ASI294MM Pro includes all the necessary adapters and spacers to reach the 55mm back focus standard required by most flatteners and reducers. By combining the included T2-M48 16.5mm extender and the 21mm T2 extender with other supplied spacers, you can build the correct distance without needing to purchase additional parts for a standard imaging train.

  • SKU ZWO-ASI294MM-P
    Camera Series ZWO ASI294
    Sensor 4/3" Sony IMX492 BSI CMOS
    Color/Mono Monochrome
    Cooling Two-Stage TEC, up to 40°C below ambient
    Pixel Size Bin2: 4.63µm / Unlocked Bin1: 2.3µm
    Pixel Array Bin2: 4144 x 2822 / Unlocked Bin1: 8288 x 5644
    Effective Pixels Bin2: 11.7 MP / Unlocked Bin1: 47 MP
    Sensor Dimensions 19.2 mm x 13 mm (23.2 mm diagonal)
    Quantum Efficiency (Peak) ~90%
    Full Well Capacity Bin2: 66.4k e- / Unlocked Bin1: 14k e-
    Readout Noise 1.2e to 7.3e
    Bit Depth Bin2: 14-bit / Unlocked Bin1: 12-bit
    Shutter Type Electronic Rolling Shutter
    Max Frame Rate 16.5 FPS at 4144x2822 (14-bit)
    Exposure Range 32 µs to 2000 s
    Onboard Buffer 256MB DDR3 Memory
    Back Focus 6.5 mm
    Telescope Interface M42x0.75
    Computer Interface USB 3.0 / USB 2.0
    Guide Port No (Use main camera guiding)
    Anti-Dew Heater No (AR window)
    Power Requirements (Cooling) 12V at 3A Max
    Dimensions 78 mm Diameter
    Weight 0.925 lb.
    OS Compatibility Mac, Windows, Linux
    Working Temperature 40°C
    Storage Temperature -10°C to 40°C
    Working Humidity 20% to 80%

    • ASI294MM Pro Camera Body

      × 1

    • Soft Padded Camera Bag

      × 1

    • Lens Cover

      × 1

    • USB 3.0 Cable (6.5 ft)

      × 1

    • USB 2.0 Cables (1.6 ft)

      × 2

    • T2-M48 Extender (16.5 mm)

      × 1

    • T2 Extender (21 mm)

      × 1

    • M42-M48 Adapter Ring

      × 1

    • T2-1.25" Adapter

      × 1

    • 1.25" Nosepiece

      × 1

    • Spacer Rings

      × 4

    • Quick Start Guide

      × 1

  • ZWO 2-Year Limited Warranty