The whole main reference for the article is worth reading http://www.visual-memory.co.uk/sk/ac/len/page1.htm http://www.visual-memory.co.uk/sk/ac/len/page1.htm

The whole main reference for the article is worth reading http://www.visual-memory.co.uk/sk/ac/len/page1.htm http://www.visual-memory.co.uk/sk/ac/len/page1.htm and plenty of other fast lenses http://www.taunusreiter.de/Cameras/Biotar_en.html http://www.taunusreiter.de/Cameras/Biotar_en.html and here is a good summary of the developments that went into it (how hard would it be to find this page if not for a link on wiki?!) http://web.archive.org/web/20090309005033/http://ogiroux.blogspot.com/2008/06/worlds-fastest-lens-zeiss-50mm-f07.html http://web.archive.org/web/20090309005033/http://ogiroux.blo...