Cheap! I'll have you know this is one of the best the Belorussian photo industry makes. The job I had hunting this little beauty.
f8mm F4 fish eye with 180 degree field of view. The other lens is a Nikon 800 mm F8 , quite a dark lens but with the new sensitivity of these new large sensors having a new lease of life.
I can't help you with the buffering or chip capacity, is it similar to the flux capacitor ?