ZWO ASI 533MC-PRO USB 3.0 Cooled Colour Camera
ZWO ASI 533MC-PRO USB 3.0 Cooled Colour CameraZWO ASI 533MC-PRO USB 3.0 Cooled Colour CameraZWO ASI 533MC-PRO USB 3.0 Cooled Colour CameraZWO ASI 533MC-PRO USB 3.0 Cooled Colour Camera

ZWO ASI 533MC-PRO USB 3.0 Cooled Colour Camera

  (10 Reviews)
✓ 2 year warranty


1x in stock shipped 1-2 working days

About this product

Model:  zwo_asi533mc-pro
Part Number:  ASI533MC-P

Features Sony's highly sensitive 9MP IMX533 sensor, 2-stage TEC cooling and no Amp Glow! 

The ASI533MC PRO features SONY’s latest back illuminated IMX533 sensor, with a square (15.97mm diagonal) 9.07MP sensor that is ideal for astronomical photography needs and can be considered as the latest iteration of the venerable ASI183MC Pro.

As you would expect this latest generation camera not only retains key features of the ASI183 series such as an attractive QE figure, high frame rate along with other excellent characteristics of the ASI183 cameras, but also now includes new and improved features such as zero amp glow, extreme low read out noise (as low as 1.0e), 3.76 microns pixel size and an improved 2 stage TEC cooler giving enhanced cooling capabilities.

The IMX533 is a 9MP CMOS image sensor with a square format and 3.76 um pixel size, capable of producing frames at 20 frames/sec in 14bit mode.

Read out 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.

All ZWO cameras include a 2-year warranty. 


  • Sony IMX533 Sensor
  • 256MB DDR3 Memory Buffer
  • Zero Amp Glow!
  • Regulated two-stage Tec-Cooling: 35 degree below ambient temperature
  • Extremely low read noise - 1.0-3.8e
  • 14Bit ADC - provides real 14bit dynamic range
  • Electronic shutter - no issues with vibrations sometimes found in mechanical shutters
  • USB3.0 Port (back compatible with USB2.0) - 20fps@3008x3008
  • AR coated protective window - all light can pass
  • Compatible with Windows / Mac OS / Linux

IMX533 backlit sensor

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

DDR Memory Buffer

ZWO Pro cameras feature a 256MB DDR3 memory buffer to enable data transfer stability and reduced amp-glow caused by the slow data transfer speed when using a USB2.0 port. 

Camera Field of View Simulator

Camera Performance

Low read-out noise, high dynamic range.

QE Curve

We suppose the QE peak value is more than 80%.

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.

With amp glow – exposure 300 second exposure:

ASI553 frame with no amp glow – Exposure 300 seconds:

Dark Current

ASI533MC Pro – ASI183MC Pro Comparison

Mechanical Diagram



What's in the box

  • ASI533MC-Pro Camera
  • Soft Padded Case
  • T2-1.25" Nosepiece Adapter
  • 1.25" Cap
  • 2-metre USB 3.0 Cable
  • USB 2.0 Short Cable x2
  • T2-1.25" Adapter
  • T2 Extender 21mm
  • T2-M48 16.5mm Extender
  • M42-M48 Adapter
  • Spacers x3


Sensor Sony IMX533MC
Diagonal 15.97mm
Resolution 9 Mega Pixel 3008*3008
Pixel Size 3.76μm
Max FPS at full resolution 20fps
Bayer Pattern RGGB
Shutter Rolling shutter
Exposure Range 32μs-2000s
ROI Supported
Read Noise 1.0-3.8e
QE peak TBD
Full well 50000e
ADC 14bit
DDRIII Buffer 256MB

Non-volatile memory /
On camera storage

Build-in total 192K byte user-accessible space
(image size up to 480X320)

Interface USB3.0/USB2.0
Interface USB3.0/USB2.0
Adaptor M42X0.75
Protect window D32-2-AR
Dimensions 78mm Diameter
Weight 470g
Back Focus Distance 17.5mm
Cooling Regulated Two Stage TEC
Delta T 35°C-35°C below ambient
Camera Power consumption 650mA at 5V
Cooler Power consumption 12V at 3A Max
Working Temperature -5°C—45°C
Storage Temperature -20°C—60°C
Working Relative Humidity 20%—80%
Storage Relative Humidity 20%—95%


Supported Resolutions:


  • 3008×3008 19.88fps
  • 1920×1080 54.11fps
  • 1280×720 79.74fps
  • 640×480 116.55ps
  • 320×240 216.45fps

Additional resolutions can be user defined.

Downloads / Manuals

The following manuals and downloads are available for this product:


ZWO Software and Drivers


Customer reviews

Average Rating (10 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Thursday, 22 July 2021  | 

Wanted to wait until I could give a fair review of this camera and due to cloud/rain this has been weeks! Now finally I can honestly say that it is fantastic. I deliberated for ages on whether to keep going with my DSLR or take the plunge and get a cooled dedicated astro camera as it is a big financial investment. The ease of use has meant it it a breeze to set up with my Asiair pro and having all the spacers included takes away the headache of working out back focus. I'm not tech savvy or can claim to completely understand all the technical details of this camera but I can tell that the picture quality blows my little DSLR out the water and makes it so much easier to post process. Thanks as always to FLO for speedy delivery and good communication.

Rating (max 5):  
Great deal with a wise team
Thursday, 27 May 2021  | 

I was in a need of dedicated astro-camera, and Alex from FLO helped me a lot deciding to buy all the accessories needed for attaching this camera to my telephoto lens.
With the performance of this camera, this has a newer sensor with zero amp glow. So far I am getting impressive photos.
5 stars for the camera, and the wise, kind, and helpful team. 🙂

Rating (max 5):  
Amazing camera.....but....
Friday, 30 April 2021  | 

Got the camera in a few days, and its my first venture into colour CMOS. Ive only had a few days to test the camera (under a moon glow), but still had some great results. However it was delivered to my house and left on the doorstep, the only way I knew it was there was when I decided to track the item, it stated "received/delivered. Didnt hear a knock at the door, and anyone could have taken it, unsigned for, and at nearly a grand is a worry to say the least. Other than a DHL issue. FLO are as usual very good as always.

Rating (max 5):  
Same old same old from FLO
Wednesday, 28 April 2021  | 

Ordered the camera and it was delivered the next morning, very well packed and perfect. Now just need a few less clouds…

Rating (max 5):  
ZWO ASI533MC-Pro cooled camera.
Tuesday, 6 April 2021  | 

I had the ASI294 MC-Pro camera before this which started off quite well but turned into a complete nightmare. Thanks to the F.L.O. fantastic customer service I was able to return it.
I now have the ASI533MC-Pro camera which has proved to be an absolute joy to use.
I have imaged a few galaxies since Wednesday 31st March when I received the camera and have had really impressive results.
It is so simple to use, just set your back focus and Unity Gain and off you go.
So far the square sensor hasn't been an issue as the galaxies I have imaged have all fitted nicely in the frame. It will be interesting to see how nebulae frame up using my ED100 DS Pro scope, but it doesn't really matter as I have a wide field setup that I can use.
Processing images has been a joy due to the low noise images at the -10 cooling setting that I am using.
I'm so glad I didn't give up on getting a cooled Astro camera and so happy to have found a camera that does everything I want it to.
Thanks again for the first class service. I was made to feel very important as a customer and I really appreciate that.

Rating (max 5):  
Friday, 2 April 2021  | 

Over the last 6 months i've slowly been building my AP set up, the ZWO ASI 533MC-Pro is the final part I needed. It only arrived last Monday so i've yet to start using it. First impressions are good. It seems like a good quality very well made piece of gear & i'm looking forward to pairing it with my Samyang 135ED f2 lens & ZWO ASIair Pro.
I dropped a star for this review as I was disappointed to see it didn't include a DC power cable for the cooler. Its only a small niggle & one I knew about after researching the camera but considering the cost of this camera ZWO could easily include one as its a bit like buying a good quality TV only to find it doesn't come with a plug . I already have a spare cable that actually comes as an 'extra' with the ZWO ASIair ( The irony of that is not lost on me) so its not a big deal but I thought I should mention it so potential buyers are aware they will need to get one. This aside, i'm very happy with it.

FLO's consistently good service had it delivered within 2 days of purchase, all packaged up very securely & safely, one of the many reasons why I always use FLO for my astro purchases.

Rating (max 5):  
Great service
Tuesday, 9 March 2021  | 

The order was expedited in short order and arrived in a well-packed state. The little dark skies available since receipt has not allowed extensive testing but the results so far are excellent and up to expectations.

Rating (max 5):  
Excellent camera
Thursday, 17 September 2020  | 

I pondered about this camera for a long time and decided to take the plunge - I was a bit unsure about the square sensor but in use it really doesn’t matter, In fact framing an object by rotating the camera is much easier with the square sensor.
I was using the camera with Astrophotography Tool, and on my first night out I had a few issues with the colour which gave a very pronounced blue cast to my images, this processed out ok but the next time out I used the ZWO supplied Ascom driver and everything was spot on after that - although previously it was probably me that didn’t set it up right as this is my first ZWO cooled camera.
The camera performed flawlessly and I was delighted with the results- the cooling is great and the camera cooled down very quickly. The camera seems very sensitive and I had no problems seeing my intended target on screen. The final processed results were fantastic and I am very pleased I chose this camera as it fits my optical set up perfectly.
Thanks to FLO for a speedy delivery as usual.

Rating (max 5):  
ASI 533 MC Pro OSC camera
Thursday, 10 September 2020  | 

Stangely I've had this camera about a week and I've had 3 clear(ish) nights amazing!
OK. I bought this to go with a Celestron RASA 8 and an Altair 115 EDT-APO refractor giving arc/sec readings of circa 1 & 2. I like the square format as many nebulous objects are approximately round e.g. NGC281, Rosette etc...
I found that the statement of 'no amp glow' is true for me with exposures upto 600 seconds, I've had no need with the RASA to go longer. Processing I've found to be even across the frame (after flat removal) in PI, APP and Photoshop.
I'm still experimenting with settings at present but I would certainly recommend this camera for it's ease of use especially if it's a first toe in the cooled OSC market.

This camera is really excellent. I've been lucky with a few moonless clear nights and put the camera to work on various objects, Heart (IC-1805) and the Shark nebula (LDN1235). These captures were obtained using a UV/IR cut filter only between the OTA and the sensor, thus enabling shorter sub lengths.
Processing has been much simpler. The absence of amp glow, it's low noise at unity gain plus an even colour response have meant less hassle trying to drag details out of integrations. Certainly the best OSC camera I've owned.
Francis Milsom
September 2020

Rating (max 5):  
First light of my ZWO ASI 533MC-PRO USB 3.0 Cooled Colour Camera from First light Optics
Friday, 8 May 2020  | 

I bought this camera to use with my 14" Celestron Edge, in conjunction with a HyperStar. It has the outside diameter and optical resolution that meets the geometry of the system. Last night was the first opportunity to use it and it worked faultlessly. I am very impressed with its performance.
Whilst writing, I want to congratulate First Light Optics and their staff for their customer service during this difficult time. Their response to enquiries and performance on delivery are second to none!


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