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ZWO ASI533MC Pro USB3.0 Cooled Color Astronomy Camera


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  • Plan to shoot without a light pollution filter? We recommend the ZWO 1.25" IR Cut-Off Filter
  • 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
    Protect WindowD32 2 AR
    Read Noise3.8e
    Sensor Diagonal16 mm
    Sensor TypeCMOS
    SensorSony IMX 533
    Weight1.04 lb
  • included items

    ZWO ASI533 Included Items

Product Reviews

Customer Reviews
5.0 Based on 20 Reviews
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Alex M.
United States

Great imager

This is a fantastic little camera. I can do much longer color exposures then I have in the past. With very low amp glow, I think this sensor will work!

Tjay H.
United States United States

Learning Curve Check

It's definitely everything that it's said to be. Using an unmodified T3i DSLR prior to the 533MC there was a significant learning curve that took me 4 failed nights of shooting to get dialed in. First up, and already knowing photography I should have caught this one right off... but 2 nights later the lightbulb came on and I remember that with the smaller sensor I wasn't just getting more reach... I was losing a ton of light... my scope is a f/5.9... then times the crop factor of the 533MC that put it around f/16.... explained why I could see stars... but no nebulosity. Being new to gain... and this new strange shaped camera I upped the gain to 220, and left the subs at 300 secs... about the best I can do with my star adventurer.... this did brighten things... but it also blew out the stars really bad... and I torched another night. Then it dawned on me that I have noticed a lot of folks use a reducer... another light bulb... I only have a flattener... so I purchased the orion .8 reducer... working on a budget here folks... lol so with that now I'm at around f/12... still not spectacular... but better than f/16. Now that I have the light sorted... a gain of 105, and subs of 280 (just couldn't get in the sweet spot for anything more) I finally got a shot of the inchworm cluster which has some nice red nebula something prior to the 533MC I wouldn't have even tried to shoot. There were some other learnings that had to be had with working with fits files, and how DSS works with those... but I'll not bore with all those details... so to sum up great camera, with the power cord it cools, but will work without it. The aspect ratio is a little strange, but probably just me since I've worked with DSLR's, and skipped the whole square instagram image phase. Very low noise, and yep no amp glow as advertised. Nice bag to keep it safe is a nice touch, and all the adapters/spacers were a must so nice they were included. 2 thumbs up, and if you don't have a reducer... or a super fast scope then order a reducer with the camera. Clear Sky's to all!

OPT Telescopes ZWO ASI533MC Pro USB3.0 Cooled Color Astronomy Camera Review
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