I got a Crown Graphic (4x5) that came with a Graphex 135mm f/4.7. Starting with that "odd" (to me) aperture, 4.7, this lens also has different shutter times than I'm used to. After 1/2 of a second it jumps to 1/5 then 1/10 then 1/20, 1/50, 1/100, 1/200, and 1/400. So, how am I to use these "new" times? If my light meter gives me a reading of f/4 at 1/4 am I supposed to use f/4.7 at 1/5 or how does that work?
Thanks.
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