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<blockquote data-quote="Bob Blaylock" data-source="post: 353498" data-attributes="member: 16749">It's not on the mirror.&nbsp; The mirror only affects the view through your viewfinder, and not what actually gets recorded as an image.&nbsp; When you take a picture, the mirror flips up out of the way, allowing light from the lens to get directly to the sensor.&nbsp; Your mirror could be so filthy or so damaged that you can't even see through the viewfinder, and it still wouldn't affect the picture that gets recorded.&nbsp; By the way, you do understand that this is a first-surface mirror, and that first-surface mirrors are very delicate, right?&nbsp; Yes, you've definitely got some dirt on your sensor.&nbsp; If compressed air doesn't do the trick, the next thing to try is <a href="http://www.amazon.com/gp/product/B000LQQQZQ/" target="_blank">this brush</a>; buy it, read the instructions carefully, and follow them.&nbsp; If that doesn't do it, then you need to get a wet-cleaning kit, such as <a href="http://www.amazon.com/gp/product/B000PNGM18/" target="_blank">this one</a>.&nbsp; It is one of the unfortunate facts of life about DSLRs (probably equally with MILC/EVIL cameras as well) that dirt does eventually get on the sensor, and you need to know how to clean it and be equipped to do so.</blockquote>

[QUOTE="Bob Blaylock, post: 353498, member: 16749"] It's not on the mirror. The mirror only affects the view through your viewfinder, and not what actually gets recorded as an image. When you take a picture, the mirror flips up out of the way, allowing light from the lens to get directly to the sensor. Your mirror could be so filthy or so damaged that you can't even see through the viewfinder, and it still wouldn't affect the picture that gets recorded. By the way, you do understand that this is a first-surface mirror, and that first-surface mirrors are very delicate, right? Yes, you've definitely got some dirt on your sensor. If compressed air doesn't do the trick, the next thing to try is [url=http://www.amazon.com/gp/product/B000LQQQZQ/]this brush[/url]; buy it, read the instructions carefully, and follow them. If that doesn't do it, then you need to get a wet-cleaning kit, such as [url=http://www.amazon.com/gp/product/B000PNGM18/]this one[/url]. It is one of the unfortunate facts of life about DSLRs (probably equally with MILC/EVIL cameras as well) that dirt does eventually get on the sensor, and you need to know how to clean it and be equipped to do so. [/QUOTE]

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