This week's lesson in A Year With My Camera: Aperture.
This week we learned about the creative effect of aperture:
the ability to affect depth of field or blurring of the background.
The lower your f-number, the higher the aperture, and the smaller your depth of field.
Only the subject of the picture is in focus.
The higher your f-number, the lower the aperture, and the larger your depth of field.