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ZWO ASI533MC Pro USB3.0 Cooled Color Astronomy Camera


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  • Cooled color CMOS astronomy camera can capture at 20 FPS.
  • Sony IMX533 1-inch square sensor.
  • 3008 x 3008 resolution.
  • 3.76 micron pixel size.
  • 1.0e low read noise.
  • Full well at 50000e.
  • QE of 80%.
  • 14-bit.

Product Details

  • The ASI533MC Pro features Sony's latest back-illuminated CMOS IMX533 sensor. Its 1-inch, square, 9.07 MP sensor is ideal for astrophotography and can be considered an iteration of the venerable ASI183MC Pro.

    This latest generation camera retains key features of the ASI183 series--such as an attractive QE figure and high frame rate--but now includes zero amp glow, extreme low readout noise (as low as 1.0e), 3.76 microns pixel size and an improved 2 stage TEC cooler.

    Below you'll see an incredible image of the Rosette Nebula taken by Jason Guenzel using the Triad Ultra on the super-fast f/2.2 Celestron RASA telescope and using the ZWO ASI533 Camera! 

    Jason Guenzel Nebula with RASA and Triad Ultra

    The Sony IMX533 Sensor

    The IMX533 is a 1-inch, 9 MP CMOS image sensor in a square format with a 3.76 um pixel size, capable of producing frames at 20 frames/sec in 14-bit mode. Its readout noise is as low as 1.0e which makes it comparable to SCMOS or EMCCD sensors and highly suitable for high-definition, low-noise imaging.

    Back-Illuminated Sensor Design

    Sony's back-illuminated CMOS image sensor improves sensitivity and noise reduction - the key factors to enhancing image quality, while radically realigning their fundamental pixel structure from front-illumination to back-illumination. It has retained the advantages of CMOS image sensors such as low power consumption and high-speed operation.

    With a conventional front-illumination structure, the metal wiring and transistors on the surface of the silicon substrate that form the sensor's light-sensitive area (photo-diode) impede photon gathering carried out by the on-chip lens. A back-illuminated structure minimizes the degradation of sensitivity to optical angle response, while also increasing the amount of light that enters each pixel due to the lack of obstacles such as metal wiring and transistors that have been moved to the reverse of the silicon substrate.

    Sony developed a unique photo-diode structure and on-chip lens optimized for back-illuminated structures, that achieve higher sensitivity and a lower random noise without light by reducing noise, dark current, and defect pixels compared to the conventional front-illuminated structure.


    Camera Performance

    Low readout noise, high dynamic range.


    Quantum Efficiency Curve

    ZWO estimates the QE peak value is more than 80%. - (Graph from initial testing).

    ZWO ASI533 Wavelength Sensitivity

    Zero Amp Glow

    Traditional CMOS sensors produce a weak infrared light source during operation quite often seen in the corner of uncalibrated images as the tell-tale signs of amp glow. As the ASI533MC PRO uses zero amp glow circuitry, you won’t have to worry about amp glow even when using high gain, long exposure imaging.

    Camera with amp glow – exposure 300-second exposure:

    Camera Exposure with Amp Glow

    ASI553 frame with no amp glow – Exposure 300 seconds:

    ZWO ASI533 No Amp Glow

    Dark Current


    DDR Memory Buffer

    The ASI533MC PRO is equipped with a USB 3.0 interface, and even in 14-bit mode, can reach 20 frames per second. The 256 MB DDR3 memory ensures stable downloading of frames with increased USB speeds.

    ZWO ASI533 IMX533 Sensor

    ASI533MC Pro vs. ASI183MC Pro Comparison

    ZWO ASI533 Spec Chart

    Mechanical Diagram

     ZWO ASI533 Mechanical Drawing

    ZWO-AC-DC12V5A = American Standard.

  • specifications

    ADC14 bit
    Back Focus6.5 mm
    Camera ConnectionM42 x 0.75
    Color or MonoColor
    Delta T35C
    Dynamic Range13.7 Stops
    Free ShippingYes
    Full Rez Frame Rate20fps
    Full Well50ke
    Mega Pixels9 mp
    Peak QE80%
    Pixel Array3008 x 3008
    Pixel Size3.76 microns
    Read Noise3.8e
    Sensor Diagonal16 mm
    Sensor TypeCMOS
    SensorSony IMX 533
  • included items

    ZWO ASI533 Included Items

Product Reviews

Customer Reviews
4.9 Based on 18 Reviews
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United States United States
Easy and sensitive

For cable management, the USB ports on the back are clutch. I usually have no problem getting the sensor down to -10 except when it is 70 to 80 degrees F throughout the night. The fan is real quiet too. The square sensor takes some time to get used to, but I haven't yet had to worry about how I am going to orientate the camera. I image at zero gain and still get great results in my subs.

OPT Telescopes ZWO ASI533MC Pro USB3.0 Cooled Color Astronomy Camera Review
Kurt W.
United States United States
Nice camera

This camera is very easy to use. Replacing a ZWO ASI183MC PRO, and the larger pixels are a benefit for faint targets.

Ahmed A.
United Arab Emirates United Arab Emirates
very nice little camera

good camera I wish it cooled a little more than 35c below ambient and it had larger FOV. but for what i paid for, I can't complain. items were shipped and delivered on time and as expected .

Nicholas B.
United States United States
Updated review of the Asi 533

Still using the Asi 533mc pro almost a year later and I love it! I use it with the optolong l-extreme and the optolong l-pro filters and I love the data that comes from this camera all the time. Noise is very easy to deal with and the images are always so clean after calibration and stacking.

OPT Telescopes ZWO ASI533MC Pro USB3.0 Cooled Color Astronomy Camera Review
United States United States
Great camera

I just started using the 533 to image with an AP Traveller and it has given me great results immediately out of the box. This camera can be powered and cooled through an ASI Air (I power the Air with a 5 amp source). Acquiring good images with this camera and Air is really easy. Now ZWO just has to invent a device that can automatically post process them. These picts of M67 and M42 are single 2 min subs without any calibration taken 20 minutes after unboxing.

OPT Telescopes ZWO ASI533MC Pro USB3.0 Cooled Color Astronomy Camera ReviewOPT Telescopes ZWO ASI533MC Pro USB3.0 Cooled Color Astronomy Camera Review
Bob G.
United States United States
Quality camera

Been great so far, it cools down pretty quickly