i'm using the nikon tripod that came with the d70 but i'm mounting my canon powershot a80 on it. i realise that after i half depress the shutter button to focus and remove my finger, the camera would shift a little even after i screwed everything tightly. thus, i have to resort to using the 2 second timer.... but what if i'm shooting time critical things like fireworks, if i use the timer i might just lose the moment, please help me thanks.