ZWO ASI294MM Pro - cooled mono CMOS Camera for many fields of astrophotography

ASI cameras stand for very good workmanship and have modern CMOS sensors installed. This versatile camera uses the state-of-the-art "back-illuminated" Sony IMX492 sensor.

Sony specifies a sensor diagonal of 21.63 mm. However, due to sensor refinement by ZWO the true diagonal is 23.2 mm.

The 4.63 µm pixels of the ZWO ASI294MM Pro make this camera an all-rounder with highest sensitivity for short exposure times in deep sky photography. Additionally, binning can be switched off, then the pixel size is only 2.32 µm, which increases the detail resolution - even planets can be photographed well this way.

In addition, binning can be switched off, then the pixel size is only 2.32 µm, which increases the detail resolution.

Advantages and features of the ASI MC294MMPro mono camera:

• USB 3.0 for a fast download - can also be used with USB 2.0
• DDR3 memory buffer to help improve data transfer reliability. Additionally, the use of a memory buffer minimizes amp-glow, which is caused by the slow transfer speeds when the camera is used with a USB 2.0 port.
• Powerful Peltier cooling up to 35 °C below ambientSensitive CMOS sensor with 23.2 mm diagonal - 11.7 megapixels
• Good resolution through 4.63 µm pixels
• Switchable to 2.32 µm pixel size and resolution 8288 x 5644
• Comes with AR protection window - full transmission also in IR. If infrared should be blocked, an IR-cut filter is necessary.
• Distance from T2 connection thread (female) to camera sensor: 17.5 mm
• Very high sensitivity - QE up to 90% - ideal astronomy camera for dim objects
• 14bit
• ADCHCG mode - if gain is higher than 120 (12 dB), read noise is reduced below 2e- - result: low-noise images despite extremely high sensitivity.Full well capacity 66387e - even bright stars do not burn out anymore, you get a better signal-to-noise ratio.

Application ranges of the camera:

• Deep sky images (nebulae and galaxies): Due to the high sensitivity, nebulae and galaxies are captured after only a few seconds. By cooling down the camera up to 35 °C below ambient, the already low noise can be further reduced. By increasing gain (like the ISO setting of DSLR cameras), you can reduce exposure times below 30 seconds. Effects from seeing or inaccuracies of the drive are eliminated.

• Lunar and planetary images: extremely short exposure times (due to high sensitivity) freeze the seeing. Through the high resolution of the sensor, many details can be reproduced even at shorter focal length. Video astronomy is also possible.

Important: external power supply required!

Please notice that all ZWO cameras with cooler need to be connected to an external 11-15 V power supply to work.
Even when the cooler is not being used the power supply must be used for the camera to be reliably recognized.

Practical tip 1 from APM: Integration of 2" filters, 360° rotation and quick coupling

The camera is often used on correctors that do not have a filter thread. In addition, the filters should always be used as close as possible to the camera. Here we offer you a solution that can do much more.

• 2" filter holder directly in front of the camera
• 360° rotation for the right choice of the image section
• Quick release - you can remove the camera from the remote ear at any time, without screws and thus entangling the cables

The adaptation is very simple, the 21 mm T2 extension is replaced by:

• 1x TSROTT2-T2 and 2x T2AbstimmA1

One tuning ring comes to the camera side, one tuning ring comes to the telescope side of the rotator. Then screw on the M42-M48 adapter with 16.5 mm length and you are in the right distance with the camera.
Downloads, DriversZW Optical supplies software and drivers online for free download:

Software and drivers for all ZWO cameras

Frequently Asked Questions about ZWO Cameras:

The FAQ section is constantly updated by ZWO, here you can find the answers to many questions.

FAQ about ZWO cameras

ZWO Users Forum

Manuals for ZWO products:

The manuals page is constantly updated by ZWO, here you can find user guides for ZWO products.

Link to the manuals

How to clean my ZWO camera:

The manufacturer provides a manual that covers how to clean an ASI camera and regenerate the desiccant tablets: Please click here.

Astrophotographic results obtained with this camera on Astrobin

Here you can find some astrophotographs made with this camera model: Link to Astrobin

Scope of Delivery:

• ASI camera cooled, with 11 mm T2 ring
• Camera bag
• USB3.0 cable, 2 m
• Quick Guide (English)
• T2 extension (21 mm long)
• M48 to T2 adapter (16.5 mm long)
• Adapter from T2 to 1.25" socket with filter thread
• Dust cap 1.25"
• M42-M48 adapter (without optical path)
• 2x USB 2.0 cable, 0.5 m
• Flat adapter T2 to 1.25" thread (without optical path)
• 4x spacer ring