Hi Jim I am probably one of the least experienced here but i will also hazard a thought, with an effective focal length of 600mm and a shutter speed of 125th even with a cable release it is possible there has been some sort of vibration issue connected with mirror slap etc.... Even with a good tripod head and tripod bracket for the lens:-) I can't remember whether there is the option to lift the mirror early with he 510 (Olympus call it anti shock on the E1) but if nothing else the self timer can surfice for this sort of landscape shot.