Does anyone know if it's possible to mount a telephoto lense to a Go Pro 4 Silver ?

I fully understand that it's not what it's intended for, however the quality on the Go Pro is so good, I really would like to be able to film things from a bit further away.

If anyone knows of such a thing, where can I get one ?

I've seen a picture of the Deadeye Hero, but it's a bit expense and I really want a cheaper alternative.

Any ideas?

linky looks quite interesting, esp the point about the C-ring adaptor

I had not thought of this as a potential use for the GoPro having a 400mm on my Nikon, but it could be very interesting in the right application...

hth