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
==============================================
List usage info: http://www.zuikoholic.com
List nannies: olympusadmin@xxxxxxxxxx
==============================================
|