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The ZWO ASI 533MC is a colour un-cooled camera for planetary imaging and EAA and features a 9MP back-illuminated CMOS sensor with 80% quantum efficiency at 460nm. The ZWO ASI 553MC contains the Sony IMX533 CMOS colour sensor which has a diagonal of 15.99mm and a resolution of 9 MP. The Sony STARVIS back-illuminated sensor technology is highly sensitive and has exceptionally low read noise. ZWO 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 533MC has a maximum QE of 80%. The USB 3.0 Port provides 5Gbps bandwidth and lets the camera run at 20fps at full resolution. The dark current of the ASI533MC 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”.