本帖最后由 gotham 于 2009-7-7 14:23 编辑 ; Y- C- J9 k+ ? , w- G i# F; B; o; j! Z! oIt is believed that "1/focal length" is used as the minimum "safe" shutter $ Q E5 Q; T' ^2 ospeed for handheld shots. But I believe there are always some "iron hands" existed, lol