That's the original meaning before autofocus errors started dabbling
with the dictionary.
Chuck Norcutt
Richard Ociepka wrote:
> Google comes up with:
>
> Back focus is a term used to describe the relationship of the distance
> of the lens to the image device. This distance is critical to maintain
> the proper depth of field through changing focal lengths and varying
> light conditions. The correct back focus is normally achieved by
> adjusting the image pick-up device on the camera itself.
>
> The distance from the rear-most portion of the lens element to the image
> plane. It is important to adjust the back focus correctly in order to
> obtain the best image. Certain lenses come with a back focus adjustment
> mechanism, while others do not. Also, most of the cameras incorporate
> back focus adjustment, if it is not available on the lens side.
>
> Dick
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