I bought this to add some wide angle function to my system. Unfortunately I had to use step-up rings to attach it, and the extra distance from my port narrowed the angle of view, so it got bunted to the back of the dive locker.
Years later I dig it out to sell it and can find almost no information about it online. For instance, what is its coverage? 20mm? It has 55mm threads on the rear; what camera or housing is it designed to screw into? And what does 0.56X mean?
Does anyone have informative details on this beastie?
