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Message: <blockquote data-quote="JoeLewisPhotography" data-source="post: 38064" data-attributes="member: 3571">you mean 50mm?  I'm not aware of a 55mm 1.4.Crank the ISO, and jack up the shutter speed to freeze the motion. Keep the aperture high (low #).  Even at 1.4 you are bound to get some noise though.  My Daughter takes gymnastics and I know how difficult those low light action shots can be.  High ISO will be the only way you can get shutter speeds high enough to freeze the action.  If you don't mind a little motion blur, you can lower the ISO and shutter speeds for less noise.  I wouldn't go much past 1600 ISO on the D90 though, and you want speeds of at least 1/320th of a second or higher depending on how fast the movement is.  Don't even bother with that 18-105 for this stuff.</blockquote>