Hi, I was trying out some c-mount lenses whilst on a trip to Beijing recently but unfortunately I forgot to make a note of their names. I did take a photo of one though - can anyone help me identify the make of this lens? It's c-mount 25mm f1.9. I've had a look at lots of lenses of the same specification on the internet but can't find a picture of one that looks like this. Thanks for any help.