Originally posted by tobyshootspentax If it is sensor dust, would the dust still appear in the images if there is no lens mounted? I've noticed that it does not show up with no lens mounted.
It won't even show up anyway, even with a lens. It only "appears" when the focus is right, when the contrast is high, and so on. But its still there even if invisible. If you use an enlarger loupe and look at the sensor, you can probably see it on there.
Just look up some threads about this issue, there are plenty of sample photos showing you what dust spots look like