Dear friends, This question may sound very silly. But I am asking because I don't know anything about it. I have bought a Canon 450D lately. I cannot understand how to take too long (for several minutes, may be hours even) exposures with this camera. The Bulb mode allows me to press the camera as long as I keep it fully pressed. But I need to lock the shutter and do other jobs while the camera gets exposure for several minutes. Please tell me how to do it. Moreover, for minimum or no camera shake I need to use a shutter release cable (along with a lock). But somehow the cable is no more available in our city. They say that the cable has been replaced by some remote controler. Now, what is that and how to use it? Which brand is good for such a remote controler?