[scheerspeed]

Originally Posted by ZeroGravity

I am not sure what tripod you have, or what settings or exposure time you're using... but I do find that when taking longer exposure pictures with a tripod, I will use the timer delay as well... this will minimize the camera shake from my sloppy hands while pressing the button. Also, when the DSLR "flips the mirror" to take the picture, it will have vibration as well. So if the tripod / the tripod head is not sturdy enough, might see "blurriness". But the latter case should not happen too often. For me, it is mostly the first case.

Or maybe the lens is not focusing correctly in lower light conditions?? assuming that's why you're using a tripod in the first place...

well i use the tripod whenever the shutter speed falls below 1/8 of a second. i usually use manual focus.