English | 27m | Video: 720p | 511 MB
If you owned a DSLR camera from some time now, maybe you'd start to notice weird spots on your photos that shouldn't be there: They should be visible, mostly, when you shoot with high f/ numbers (such as f/16 - f/22), but they could be annoying even at bigger apertures.
There is a good chance that the spots you notice are caused by dust deposited on the sensor of your camera! It's quite a normal thing, don't worry! Every time you switch a lens with another one, or when you shoot with a zoom lens, there is a chance that dust will move and find its way to the sensor chamber and deposit itself on the sensor. 
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