Sensor Dust?

Started Jan 10, 2014 | Discussions thread
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ssww Regular Member • Posts: 205
Sensor Dust?

I have an a99. Recently I noticed a dark spot at a fixed location in all my photos. I hope you can see the spot in the dead center of the above picture. Is it a dust on the sensor or on the semi-transparent mirror? I looked at the mirror but didn't seem to see a dust matching the location of the dust. Is sensor hidden behind the mirror? Sorry for the dumb questions but I'd like to find where the dust it and the best way to remove it (an air blower?).

TIA

Sony SLT-A99
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