m12 lens

Starting a thread for this project and discussion.. this is the poor mans long range LPR setup. Camera: IPC-HFW4431M-AS-I2 ($100) Lens: 25mm Cheap-o ($20 DHL) Just installed the lens and am evaluating it, with this camera I was able to fully reassemble the camera despite the longer lens...

I'm looking for wide angle M12 mount lens between 2.1mm to 2.8mm to replace the stock 4mm lens in my 3MP Hikvision cameras. I believe I should look for IR corrected lens that is designed for megapixel cameras for lower distortion. There are many choices on ebay, but there's no way of telling...