Universal Viewfinders

HI, does anyone now something about a company that was developing universal housing viewfinder’s. Some one told me about a Spanish company is it true?

You might want to check out the link on the homepage of this site - re UK-Germany or

http://wetpixel.com/i.php/full/uk-germany-45-viewfinder/

or the discussion at

http://wetpixel.com/forums/index.php?showtopic=17049

Not aware of any others in this area but there may well be.