Interchangeable Lens Digital Camera ILCE-5100

Notes on changing the lens

When changing the lens, if dust or debris gets inside the camera and adheres to the surface of the image sensor (the part that converts the light to an electric signal), it may appear as dark spots on the image, depending on the shooting environment.
The camera's image sensor is coated with an anti-dust coating to prevent dust from adhering to it. However, always make sure to attach/remove the lens quickly, away from dusty locations.