I don't want to use a flash... I want to get the lights, and the lasers. I am going to be using the only lens I have at the moment, a f/3.5
If you have a fully manual flash (one that will allow you to manually cut the power down), you should still bring it along and practice with it just a little prior. I understand you want to maintain the club lights and effects BUT the flash doesn't have to overpower them. You can balance it out just enough to give you enough exposure on the subject directly in front and yet capture the ambiance of the background (and a little pleasant motion blur).
Remember.. there are two exposures involved....
Exposure of the background which is determined by your aperture and shutter
Exposure of the foreground which is determined by the aperture and the flash's output.
You will also want to set your camera for 2nd curtain flash exposure so the flash is fired at the end of the exposure
You meter the ambient background to determine aperture and shutter. The shutter speed might be too slow to be handheld thus motion blur but the lighting will be captured. You might also want to underexpose a stop or two to place emphasis on the lights rather than the subjects in the backgrouind. The slow shutter speed is ok just as long as the shutter is slower than flash sync speed AND not REALLY slow (like in whole seconds). Remember you are going to freeze foreground motion of a subject by flash not by the speed of the shutter. You then reduce the power of the flash until the subject right in front is properly exposed at the aperture already set (do not change aperture/shutter settings). You want to have the subject frozen but not have the flash overpower it. Once you have this settings, you should be set for most of your shots.... you can deviate the exposure by changing the shutterspeed (adjusts the background) or flash power (adjusts the foreground).
The affect is very similar to this video on the phase one demonstration of their MF digital backs. The section of the video of interest is towards the end when the model "waves" a pen light to form motion blur "Graffiti" while the flash at the end of the exposure freezes the model in place. You get a final photo with a clear sharp image of the model in her very last position with the light trailing her motion prior to the flash exposure at the end.
http://www.phaseone.com/Content/p1digitalbacks/Pplusseries/Introduction.aspx
Examples of balancing club lighting with reduced flash can also be seen on the
www.evilclubempire.com website, click club pictures at the bottom. They have photographers taking photos at 4 of their clubs throughout the night.... some good examples to spark some creativity that is beyond stretching the ISO and aperture on your camera.
WARNING: Some of the photos on that website might be considered NSFW or inappropriate for some audiences.
Here is one particular photo I liked:
http://www.evilclubempire.com/cgi-b...H=400&HEIGHT=600&TAG=perversion20080424&MAX=8