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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
    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 10 Reviews
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  • amp glow
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  • experience
  • ASI1600MMPCool
  • Star71
  • color CCD
  • ASI Filter Drawer
  • MaximDL Suite
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  • sensitivity results
Pierre-René B.
Switzerland Switzerland
Purchase at Opt

It is my first time I order a product at Opt. Everything was running smoothly and I receive my product in perfect stand one week later in Switzerland. Only delivery service of UPS in Switzerland was a bit messy.

Joe S.
United States United States
Great Camera

I've had the pleasure of using this camera for a few sessions. Combined with a short refractor, this is a great camera. Super easy to use and reliable. I run it at -10c and get virtually no noise from the camera itself. Certainly no amp glow. The square sensor takes a bit to get used to. However, I've found it makes framing a snap. The camera was in stock at OPT and came in a week.

OPT Telescopes ZWO ASI533MC Pro USB3.0 Cooled Color Astronomy Camera Review
Christoph K.
United States United States
Interesting Color Camera

Well, I have quite a bit experiences, but I dtruggel with the sensitivity results I get from the 533, maybe I have to play more with gain and Offset, but out of the box the Camera works easily with no amp glow with my MaximDL Suite. I guess, just more experience would help, but the results from my ASI1600MMPCool are much more detail containing than this color CCD. Time will tell :) Works great with the ASI Filter Drawer as a grab and go setup on a WO Star71 widefield setup.

Dr. Schulte
United States United States
Best choice if...

I love this camera, it performs excellent. ZWO is defiantly the leader in DSO cameras. If you only have room or budget for one dedicated camera in your bag this is a really great choice... if you have room for two I’d get a 294 & 183.

United States United States
Fantastic camera!

I use this for EAA and the images are very smooth, clean, and beautiful. With cooling and no amp glow, darks are optional though I often use them. GRAB ONE!

Nicholas B.
United States United States
First deep space camera, no regrets getting this

I've used this camera for a total of 30 ish hours under the stars since my purchase in June. Has immensely upped the quality of my astrophotography. Works great with dual narrowband filters such as the Optolong L-eXtreme and my Ed80/600 refractor.