ASI991MM Pro adopts 1/4" Sony-IMX991InGaAs sensor, featuring a wide band from 0.4um to 1.7um, it is the first & most powerful SWIR camera of ZWO. The camera has a large full well capacity, high sensitivity with an incredible QE peak value of 80% at 1200nm, and a big pixel size of 5um.

The great performance in capturing short wave infrared lights makes it applicable for SWIR imaging, photometric measurement, optical communication, laser & optical laboratory and more fields.

Compared to ASI991MM Pro, ASI990MM Pro has a larger resolution which will bring a larger FOV when matching the same telescope.

ASI Cooled Cameras produced after August 2023 have changed their DDR3 buffer from 256MB to 512MB.