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<blockquote data-quote="BackdoorArts" data-source="post: 235812" data-attributes="member: 9240">If you shoot you're going to get dirt.&nbsp; Six 15 minute exposures sequences comes to 5400 seconds, so I'm assuming each of your exposures was somewhere around 1 second.&nbsp; Even if they were 1/2 second you're talking about 45 minutes where the shutter is open after the mirror spend some time flapping around.&nbsp; Depending on where you are, even a closed system is going to be effected.&nbsp; if you're shooting waterfalls or anything where the ambient air is moist then it's going to get into the camera, if only slightly, so stuff like this doesn't surprise me.&nbsp; It seems any time I'm shooting long exposures, particularly with Live View, I finish off with a sensor that needs cleaning.&nbsp; Unless you can guarantee that you started with a pristine camera in front of the shutter then all that time is going to result in dust that was formerly in front of the mirror/shutter moving behind it and onto the sensor, and in a damp environment it's more likely to stick.As folks have said, learn to clean your own.&nbsp; It's not that hard.</blockquote>

[QUOTE="BackdoorArts, post: 235812, member: 9240"] If you shoot you're going to get dirt. Six 15 minute exposures sequences comes to 5400 seconds, so I'm assuming each of your exposures was somewhere around 1 second. Even if they were 1/2 second you're talking about 45 minutes where the shutter is open after the mirror spend some time flapping around. Depending on where you are, even a closed system is going to be effected. if you're shooting waterfalls or anything where the ambient air is moist then it's going to get into the camera, if only slightly, so stuff like this doesn't surprise me. It seems any time I'm shooting long exposures, particularly with Live View, I finish off with a sensor that needs cleaning. Unless you can guarantee that you started with a pristine camera in front of the shutter then all that time is going to result in dust that was formerly in front of the mirror/shutter moving behind it and onto the sensor, and in a damp environment it's more likely to stick. As folks have said, learn to clean your own. It's not that hard. [/QUOTE]

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