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Most high end CCD astro cameras retain some sort of shutter. Yes It's is used for exposure control but it also keeps dust from the sensor surface. The entire camera uses very little power. If your using a battery eliminator you never have to worry about power usage, and serious imaging shoud use a battery eliminator because batteries produce heat and we don't want any heat sources inside the camera, or at least minimise them. Shutters are very reliable mechanisms, I recently replaced the shutter module on one of my 450Ds with a new unit (cost was $42USD). The camera is now like new. The old shutter was working fine until I slipped with a screw driver during a mod and bent the curtain arm, hence the need to replace.
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