I have a Soligor 450 mm lens with a 40 mm dia camera body end thread connection. I would like to try adapting it to a D90 AF system. Are there adapter rings available out there for this purpose?
I am looking for a way to mount a Gopro to a DSLR but without using the hotshoe (already taken). That probably leaves the bottom of the camera available. The idea is to record video during photo ...