After market angle finder M ???

[photorat]

I seem to remember a Japanese company offering screw-in angle finders and diopters for Leica M but I can't find the site anymore. I do remember that due to a licensing issue, they could only sell them under the pretense that they were for SLR cameras (Leica apparently patented the idea of an angle finder for a rangefinder camera - which is like patenting the use of chocolate sauce on chocolate ice-cream).

Anyone know what I'm talking about and where I can find these guys (again)?

[johnastovall]

You are thinking about Megapearls but they don't make a right angle finder but here is one

[photorat]

Thanks, John! That was the one. But I was obviously confused about the angle finder. I wish there were cheaper alternatives for Leica's own angle finder, neat and nifty as it is. I think I'll have a crack at making my own à la nemeng's FAQ site. It shouldn't be too hard to attach a penta prism to the viewfinder.