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Like all other mirrorless cameras, the EOS M's shutter is open by default even when the camera is turned off, *******g the sensor. This may seem disconcerting to SLR owners, but we've never experienced any problem with this approach. Like Canon's live view-capable SLRs the EOS M uses an electronic first curtain to activate the exposure, and the physical shutter is only used to end it. This helps reduces shutter lag and keep shutter noise down - meaning the EOS M is one of the quieter models of its type.