i was at my nephews christening, sitting way at the back of the church, and as they were walking up the aisle, i snapped a few shots. they looked good on the D5100's LCD, but when viewing on a monitor, they clearly were not sharp. Aperture priority (set to widest) shutter speed was 1/30 focal length was 280mm (on a kit 55-300mm) auto ISO (capped at 3200, forgot what the cam actually set it to) VR on AF on what can i do to improve the sharpness? help a noob out. sorry, don't want to post the pic for privacy reasons.