90 degree adapter c mount Visual Methods Inc. Whe have also the TWIN LENS ADAPTER made by Visual Methods Inc.

Very rare new adapter from Visual Methods Inc.
Hard to find because its about 40 years old.
You can screw a camera on the adapter and a lens (90 degrees) at the other site.
Now you can use every lens to look around a corner.

Put out the orange plastic protector and screw the lens in the adapter.

www.hissink.nl