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Message: <blockquote data-quote="Nikon Photographer" data-source="post: 65503" data-attributes="member: 9882">The reason it has an aperture ring is that these older A/F lenses could be used on older manual focus cameras were you needed to set the aperture on the lens, even then on some of the M/F cameras that had program mode it needed to be locked at F22 and the camera electronics set the aperture.As the F40 doesn't have the inbuilt focus motor, you will have to set the camera to M/F and focus manually, but you can use the electronic range finder in the viewfinder to set the focus.Anyway set and lock the aperture at F22, and use the command dial on the rear of the camera to set the aperture needed, if using the manual mode, set the shutter speed by turning the command dial to set the speed, and then press the aperture control button on top of the camera, (It's the little button by the on/off switch, next to the "INFO" button, keep the button pressed and use the command dial to set the aperture needed ... using the electronic exposure display in the viewfinder to set the required setting.It will be easier to start off using Aperture priority, so set the camera to mode A, and then simply use the command dial to set the aperture you need, and the camera will set the shutter speed to match, to control the DOF, simply use a large aperture (small number) to get the background to go out of focus while keeping the foreground in focus, and to get the foreground and background both in focus use a smaller aperture (Larger number) ....Hope this helps ....</blockquote>

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