If you are using a cable release, or infra-red remote control, you could use a lighting stand. These aren't as wobble-free as a tripod, so if you're manually pressing the release button on the camera then it will oscillate badly after you've pressed the button. If you're using a remote and use mirror lock-up as well, then it should alleviate this problem. Lighting stands go very high and are dirt cheap compared to tripods. Have a look on Calumet to see what you can get. If it doesn't work because of wobble, you've still got yourself a useful bit of kit for flash work.
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