The ASI533MM PRO adopts a SONY back-illuminated IMX533 sensor, which is a 1 inch square frame sensro made suitable for deep sky astrohphotography needs. The ASI33MM Pro has high quality features such as high QE, high frame rate and also features no amp glow. Readout noise is as low as 1.0e, pixel size of 3.76 µm and a 2-stage TEX cooling.