Aperture Ghosts

[Bourbon Neat]

This was shot with a bare lens in the early morning before the sun broke the horizon, no pp. Made same shot w/CP filter which eliminates the ghosts.

Can anyone say how the aperture reflections occur and how to prevent (besides using a CP filter)?

 

[Scott Murray]

Dust on your lens or filter.

 

[Bourbon Neat]

Dust on your lens or filter.

Yuppers. Clean now. Thanks for the reality check.