Ok, so this is a question springing from not only being an amateur, but also not being able to afford an SLR of any sort until recent months... The question I have is how are photographers executing exposures of longer length (ie, 5 minute exposure...45 minute exposure of star trails, etc.), when the cameras they are using only show the ability to execute an exposure with a maximum shutter speed time of say, 30 seconds (ie, Canon 5D, 30D)? I am sure it's something ridiculously basic and elementary, I've just never seen anything documented on it. I had read something once about someone needing a remote shutter release to do this? Is it a custom setting of some sort that wouldn't be documented in the camera specs? While I'll likely be purchasing a Canon 30D or even possibly a 5D within the next year, I currently only have a Canon Rebel K2 as my SLR. Whatever the answer is to my question, is my current SLR capable of multiple minute exposures of this sort? Thanks.