i dont feel like spending 200$ on a tripod right now, so i have this old one of my dads, and after my last session shooting a bunch of 10-30s exposures i realised i really needed to do something. the legs were at full extension which would add to the problem, but it wasnt very windy, and i was using the timer on my camera. i'm thinking of slinging a bag from the tripod full of rocks or something, the thing i have to worry about then is the rocks getting blown by the wind harmonics or something and start swinging, which would make the picture worse than without using it. any suggestions?