This is a new (2019) lens for the full frame Sony mirrorless cameras. One that people had been screaming to have for a long time. It's very unfortunate that for infrared this is just as bad as Sony's first 35mm. For anyone hoping that it would perform similar to the Sony / Zeiss 55mm due to the design similarities, I'm sorry to say that it's nowhere near as good.
f/1.8 - 22