ZWO ASI533MM Pro Cooled Mono Camera


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ZWO ASI533MM PRO is the perfect introductory camera to Mono Deep Sky imaging, cools down to 35 below ambient with zero amp glow.

The ZWO ASI533MM PRO adopts a Sony back-illuminated IMX533 sensor, which is a 1-inch square frame sensor made suitable for deep sky astrophotography needs. The ZWO ASI533MM Pro can be regarded as an upgrade of the ASI183 series. Not only does it retain the high-quality features of the ASI183, such as high QE and frame rate, but it also features: no amp glow, readout noise as low as 1.0e, pixel size of 3.76 μm, 3008 x3008 array (11.31mm x 11.31mm) array and a 2-stage TEC cooling. It is highly recommended for beginners of deep sky astrophotography.

1-inch Square Frame
The IMX533 is a 1-inch square frame CMOS image sensor with approximately 9M effective pixels at a pixel size of 3.76 μm. The 14-bit digital output of IMX533 makes it possible to read out signals of 9m effective pixels at a high speed of 20 frames per second with read noise as low as 1.0e, the performance of which is on par with those of SCMOS or EMCCD sensors. This sensor is suitable for image needs that require high definition and low noise.

Full Upgrade
The  ZWO ASI533MM Pro is considered a full upgrade version of the ASI183 series.

Model ASI533MM Pro ASI183MM/MC Pro
Type Mono Mono / Color
Cooling Mono Mono / Color
Zero Amp Glow Yes No
Format 1” 1”
Resolution 3008 x 3008 5496 x 3673
Pixel Size 3.76 μm 2.4 μm
Pixel Size 3.76 μm 2.4 μm
Read Noise 1.0-3.8e 1.5-3.0e
QE 91% 84%
Full Well 50,000e 15,000e
ADC 14-bit 12-bit
Back Focus 6.5mm / 17.5mm 6.5mm / 17.5mm
MAX FPS 20 fps 19 fps
Diagonal 16mm 15.86mm

Camera Curve


Quantum Efficiency

Based on ZWO’s calculation, the peak quantum efficiency of ASI533MM Pro is greater than 91%.

Zero Amp Glow

Traditional CMOS sensors can generate weak infrared light, which is equivalent to a light source during exposures. The ASI533MM Pro uses a no-glow circuitry to ensure best quality images regardless of gain or exposure length.

2 Stage TEC Cooling
The 2-stage thermoelectric can cool the CMOS sensor to 35 degrees below the ambient temperature (based on a 30 degree ambient temperature test results). Greatly reducing dark current and thereby improving the signal to noise ratio, even with a long expose of hundreds of seconds. Note: the lower the ambient temperature is, the smaller the Delta T is.

Dark Current

USB 3.0 & 256M DDR3 Memory
ASI533MM Pro is equipped with a USB 3.0 transmission interface. In 14-bit ADC mode, the output frame rate can reach 20 frames per second. Additionally, the 256M DDR3 memory ensures a more stable data transmission during long exposure without frame loss, and can also relax the hardware requirements of the computer used for data capture.

Appreciation Work

Connection Method

Connection to External Device

Structural Dimension Diagram

ADC 14 bit
Back Focus 6.5 mm
Camera Connection M42 x 0.75
Color or Mono Mono
Cooled Cooled
Delta T 35C
Dynamic Range 13.7 Stops
Free Shipping Yes
Full Rez Frame Rate 20fps
Full Well 50ke
Mega Pixels 9 mp
Peak QE 80%
Pixel Array 3008 x 3008
Pixel Size 3.76 microns
Protect Window D32 2 AR
Read Noise 3.8e
Sensor Diagonal 16 mm
Sensor Type CMOS
Sensor Sony IMX 533
Weight 1.04 lb
Included Items
ZWO-ASI533MM-P Instruction Manual

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