The ZWO ASI 294MM Monochrome Camera is a cutting-edge solution for astrophotographers seeking unmatched sensitivity, dynamic range, and flexibility. As the monochrome counterpart to the renowned ASI294MC, the ZWO ASI 294MM combines a 4/3" back-illuminated sensor, 4.64µm pixel size, and powerful 14-bit ADC, making it perfect for deep-sky and planetary imaging.

Key Features of the ZWO ASI 294MM

• 4/3" back-illuminated CMOS sensor for superior sensitivity.
• Quantum Efficiency (QE) peaking at 90%, outperforming other models.
• 66ke full well capacity in Bin2 mode for enhanced detail capture.
• Switchable Bin1 and Bin2 modes for maximum flexibility.
• HCG mode reduces readout noise to 1.2e while maintaining a dynamic range of 13 stops.

ZWO ASI 294MM Bin1 and Bin2 Modes for Ultimate Imaging Flexibility

The ZWO ASI 294MM offers two distinct operating modes:

• Bin1 Mode: Captures images at 8288x5644 resolution with a 2.3µm pixel size. This mode delivers unmatched detail but operates with a 12-bit ADC and a 14k e- full well capacity.
• Bin2 Mode: Ideal for deep-sky imaging with a resolution of 4144x2822 (11.7 MP) and 4.64µm pixel size. It utilizes a 14-bit ADC and provides a massive 66ke full well capacity, balancing detail and exposure efficiency.

ZWO ASI 294MM Unrivalled Quantum Efficiency and Dynamic Range

The ZWO ASI 294MM with a Quantum Efficiency (QE) peak of approximately 90%, the ZWO ASI294MM  delivers exceptional performance in low-light conditions. Combined with HCG mode, which minimizes noise without compromising dynamic range, this camera ensures stunning astrophotography results across faint and bright celestial objects alike.

ZWO ASI 294MM Seamless Connectivity for Advanced Astrophotography

The ZWO ASI294MM is equipped with a USB 3.0 interface, offering fast data transfer rates of up to 5Gbps. It supports full-resolution imaging at 19fps in 12-bit mode or 16.3fps in 14-bit mode. An ST4 port is included for effortless autoguiding, ensuring precise tracking during long exposures.

ZWO ASI 294MM Specifications

Why Choose the ZWO ASI 294MM?

The ZWO ASI 294MM Monochrome Camera is designed to meet the needs of astrophotographers seeking high performance. Its versatile Bin modes, outstanding QE, and low noise levels make it ideal for deep-sky imaging and planetary photography. Capture breath taking details across a range of celestial objects with the ZWO ASI294MM .

ZWO ASI 294MM What’s in the Box?

• 1 x ZWO ASI 294MM 
• 1 x USB 3.0 Cable
• 1 x ST4 Cable for Autoguiding
• 1 x 1.25” Nosepiece
• 1 x 1.25” Dust Cover

Order Your ZWO ASI 294MM Today!

The ZWO ASI 294MM offers unparalleled performance, making it an essential addition to any astrophotography setup. Order now and experience the incredible sensitivity and flexibility of the ZWO ASI 294MM for yourself. Limited stock available – don't miss out!

By popular demand, we now introduce the ,ZWO ASI 294MM  the monochrome version of the ASI294MC. Some of the highlights include:

• Back-illuminated sensor – improving sensitivity and reducing noise.
• 4/3” format with 4.64 um pixel size – ideal for many types of telescopes.
• 14-bit ADC – giving high dynamic range.
• An impressive 66ke- full well capacity.
• 4144*2822 high resolution – with the Bin1 mode the camera can operate at a resolution of 8288*5644 and pixel size of 2.3 um.

ZWO ASI 294MM 

On top of this, not only does it have a very high QE value with a peak at about 90%, but also feature an ultra-low readout noise of 1.2e. If you are looking for a small-format monochrome camera for planetary imaging, you can’t go wrong with the ASI294MM.

Sensor length*width: 19.1*13.0mm. Diagonal: 23mm.

ZWO ASI 294MM HCG Mode

The full well capacity of 66387e of ASI 294MM is near the top of all ASI planetary cameras. It ensures a very high dynamic range of up to 13 stops that will greatly reduce the issue of overexposed images and also help to collect richer colour information.

When the gain value is set to 120, the HCG high gain mode is turned on. We’re not saying it’s magic…but we’d like to think it is pretty close. With the HCG-mode turned on, the readout noise is greatly reduced, and the dynamic range is basically unchanged.

Unlocked Bin1 Mode

Yet another perk of the ASI294MM is that the pixel size is switchable – you can switch between unlocked Bin1 mode and Bin2 mode anytime in your astrophotography software. The unlocked Bin1 mode changes the pixel size into 2.3um and increases resolution to 8288×5644. The ability to unlock bin1-mode was a popular request from our customers. Of course we listened to you and worked quickly to make it possible.

Remember that using Bin1 mode will decrease the full well capacity compared to the standard bin2-mode.

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

Bin2: 14bit ADC, 4.6um pixel size, 11.7 megapixels, 4144*2822 resolution, 66k full well capacity.

You can learn more differences between unlocked Bin1 and Bin2 modes by comparing the performance charts.

If the sampling accuracy you get with the 2.3um pixel size falls within a reasonable range, then the unlocked Bin1 mode will help you get more object details. However, you will lose dynamic range and ADC bit depth. Also the image files you get at Bin1 will probably be around 4 times bigger than Bin2.

So in the end the unlocked Bin1 mode is double-edged, you may choose to use it or not depending on the specific circumstances during your imaging sessions.

QE Value

As ZWO’s latest BSI (backside illuminated type) mono camera, ASI294MM has very high QE performance, not only higher than its color version, but even ASI1600MM. It is estimated that the QE peak value is about 90%.

ASI294MM vs ASI1600MM

USB 3.0 Port & ST4 Port

USB 3.0 Port: Providing 5Gb bandwidth to let ASI294MM run at 19fps (12bit, high speed mode) or 16.3fps (14bit, normal mode) at full resolution (11.7Mega, Bin2).

ST4 Port: Can be used to connect with auto guide port of mount for guiding.

Mechanical Diagram

What’s in the box?