alan writes: : Hi ho, : : What happend to WJ'Markerink's home page? I googled and the links don't : work. Maybe just a server problem today?? Tring to find his list of : lens flange depths. : : http://www.a1.nl/phomepag/markerink/mainpage.htm : : BTW his are omnibus photo info pages. : try here: http://web.archive.org/web/*/http://www.a1.nl/phomepag/markerink/mounts.htm (I might have to pdf a few pages myself :) this looked ok too http://en.wikipedia.org/wiki/Lens_mount karl