本帖最后由 gotham 于 2009-7-7 14:23 编辑 , G% L" [% S$ F+ R 6 a. c3 q( L; d! M2 ]0 x3 hIt is believed that "1/focal length" is used as the minimum "safe" shutter 0 r/ z& S3 K& T- \& Y6 Mspeed for handheld shots. But I believe there are always some "iron hands" existed, lol