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The ZWO ASI 533MM PRO is the long-awaited monochrome version of the incredibly popular ASI533MC Pro cooled camera and features a 9Mp back-illuminated CMOS sensor with 91% quantum efficiency at 460nm.
The ZWO ASI 553MM contains the Sony IMX533 CMOS monochrome sensor which has a diagonal of 15.99mm and a resolution of 9 MPx. The Sony back-illuminated sensor technology improves sensitivity and reduces the noise for the best performance.
The ZWO PRO cameras incorporate a 256MB DDR3 memory buffer that improves data transfer reliability and it minimizes amp-glow caused by slow data transfer speeds.
A higher QE means more of the light is converted into signal. The ASI 533MM has a maximum QE of 91%.
The USB 3.0 Port provides 5Gbps bandwidth and lets the camera run at 20fps at full resolution.
The USB 2.0 Hub allows to connect 2 USB controlled accessories such as a filter wheel, a guiding camera or an electronic focuser, reducing the amount of cables that run directly from your computer.
The thermoelectric cooling system allows a ΔT of 35°C below ambient.
Note: All cooled ZWO cameras require an external power supply of 12V at 3-5A with a 2.1×5.5 mm connector (positive tip).
The dark current of the ASI533MM is extremely low, based on our test results.
Traditional CMOS sensors emit a weak infrared light and quite often it is seen in the corner of uncalibrated images. This is called "amp glow". The ASI533MM PRO uses a zero amp glow circuitry which eliminates the problem, even when using high gain and a long exposure.
With amp glow – exposure of 300 seconds:
ASI553 frame with no amp glow – exposure of 300 seconds:
Sensor |
1″ CMOS Sony IMX533CLK-D - mono |
Resolution |
9 megapixels 3008 x 3008 |
Pixel size |
3.76 µm |
Sensor size |
11.31 mm x 11.31 mm (16 mm diagonal) |
Quantum efficiency |
91% |
Exposure range |
TBD |
Read noise |
1.0 e (@ 30 dB) |
Full well capacity |
50,000 e |
Bit rate |
14 bit |
Speed |
20 fps |
Shutter type |
Rolling shutter |
Cooling |
ΔT of 35°C |
Memory buffer |
256Mb DDR III |
ROI |
Supported |
Compatibility |
Mac, Windows, Linux |
Protecting window |
D32-2 AR coated |
Ports |
USB 3.0 / USB 2.0 |
Back focus |
6.5 mm |
Connections |
2" / 1.25" / M42 x 0.75 |
Dimensions |
Ø 78 mm; ↨ 77.5 mm |
Weight |
470 g |
Power supply |
9-15V 3 A (2.1×5.5 mm connector) |
SKU |
ASI533MM-P |
- Camera bag
- Camera body
- USB 3.0 cable (2 metres)
- 21mm extender (M42 male - M42 female)
- 16.5mm extender (M48 female - M42 male)
- 11mm M42 female extender (screwed to the camera)
- Nose piece (M42 male to 1.25" female)
- Internal adapter M42 (female) to M48 (male)
- 2x USB 2.0 cables 0.5m
- M42 male to 1.25" filter thread (necessary to connect a 1.25" filter inside the 11mm extender)
- 1 x 0.1mm spacer
- 2 x 0.2mm spacer
- 1 x 0.5mm spacer
- Quick guide
- 1.25mm plastic cap
I always start my reviews stating how noob I am in astrophotography... but this camera is the sweet spot for inexperienced astrophotographers like me. The sensor is small enough to make everything easier and the calibration files are a pleasure to make.
The small sensor size is helping to postponing the inevitable drama to have to upgrade the storage hardware in the computer. The file size is acceptable and will not require special setups.
I had zero problems with the cooler and no vibrations transferred to the sensor even with 8h of 100% cooling power.
Great little monster. 100% recommended