I bought an Air Ministry Dallmeyer Pentac 8 inch aerial reconnaisance lens about ten years ago from a flea market stall in London's Spitalfields antique market. At the time I was doing a lot of people shoots and had fancied the look of a Kodak Aero Ektar...but was put off by the radioactive thorium in the glass and the price! Eight inch Air Ministry Pentacs are the British Wartime equivalent of the American Aero Ektar and used to hang out the bottom of Spitfire wings on reconnaisance missions. There's quite a lot of information out there about Aero Ektars, but less about these lenses which perform...