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<blockquote data-quote="BackdoorArts" data-source="post: 271356" data-attributes="member: 9240">I think this is a bit of a stretch to go straight to this assumption, particularly without knowing how often and under what conditions the lens may have been swapped.&nbsp; The UK has been rather damp of late, so any dust creeping in is likely to stick.&nbsp; I'd say that easily 50% of the dust I see on my sensor never budges with a blower once it's on there, so if this is the only spot I would call it normal and not point to a shutter disintegration.&nbsp; All that said, take it to your dealer and they may offer to clean it, but don't be surprised if they want to charge you.&nbsp; Cleaning the sensor stack, as Martin said, is not difficult and should be considered a necessary skill to develop for any photographer.And for the record, oil spots will always develop in clumps in the corners and will be round and translucent.&nbsp; So when you see spots scattered throughout the frame or along the long edges, it's dust and dirt.</blockquote>

[QUOTE="BackdoorArts, post: 271356, member: 9240"] I think this is a bit of a stretch to go straight to this assumption, particularly without knowing how often and under what conditions the lens may have been swapped. The UK has been rather damp of late, so any dust creeping in is likely to stick. I'd say that easily 50% of the dust I see on my sensor never budges with a blower once it's on there, so if this is the only spot I would call it normal and not point to a shutter disintegration. All that said, take it to your dealer and they may offer to clean it, but don't be surprised if they want to charge you. Cleaning the sensor stack, as Martin said, is not difficult and should be considered a necessary skill to develop for any photographer. And for the record, oil spots will always develop in clumps in the corners and will be round and translucent. So when you see spots scattered throughout the frame or along the long edges, it's dust and dirt. [/QUOTE]

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