ZWO ASI 533MM PRO

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:

Traditional CMOS sensors produce a weak infrared light source that is often seen in the corner of uncalibrated images as bright glow. The ASI461MM Pro uses the zero amp glow circuits that avert this artefact in your images.