This M12 mount lens has a 1/2.5" optical format and an effective focal length of 1.7mm. The FOV depends on the camera/mount being used but is typically between 118° and 180°.
The thread on this lens is 13mm - please check the mount/camera you're planning to use this with before purchasing.
Note: This listing is for the lens only - no HQ mount adapter included.
An amazing lens for the price and high performance.
For complicated reasons I can't go into, I am taking these apart and reusing the bits.
Here's a picture that shows what you get for your money.