Alloy high strength steel EX-Ten The F70 will entice you with a complete autofocus system that helps you work a scene the way you see it the EX-Ten, the F80 Full Hard of HF-50 of HF-60 HF-70 of HF-80 Hi-Steel (low s) HSL-A-80 of HSLA-100 HY-80 45CV Jalloy the AR Kaisaloy, Kaisaloy 45FG Kaisaloy 50CR Kaisaloy 50CV Kaisaloy 55CV Kaisaloy 60CV Kaisaloy 65CV Kaisaloy AR Lukens A242 Lukens A588 Lukens Gr.45 Lukens Gr.50 Lukens Gr.55 Lukens Gr.60 Lukens Gr.65 Man-Ten Mayari R Mayari R -50