haha...thx
i have tried shooting star trails b4...even in more windy conditions on a tripod and longer exposure times....but the results this time had surprised me....i guess maybe it's cos at 300mm the vibration is much more sensitive (but i already had Vibration Reduction (VR) on)...anyway thx for the clarification...i better go back to normal shooting...astronomy photography is something out of many that i cant afford to play hahaa