Ged,when its really sunny and the rays are wafting through the window...jump up and down and then take a couple of photies at the window,examine them and you will see the other half has not cleaned up very well.
When we walk in a dusty enviroment we kick up loads of dust we might not see it in normal light but we can when light is shimmering through a dark room or area.
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Those dust particles pass by the lense at close proximity to the glass or near the glass and give a magnified account in the picture taken
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