ajcotterell

In 1956 at the Navy's School of Photography in Pensacola, FL, we referred to 'Depth of Focus' as "depth of field." This term referred to the range of distances, near to far, in the field of view of the lens used that were rendered in sharp detail. Depth of field could be seen on the glass of the 4x5 Graphic View Cameras we used, and was controlled generally by the focal length of the lens being used (shorter focal lengths had inherently greater depth of field at all apertures), the point of prime focus, and the f/stop or aperture. When the old view camera was used, of course, there were adjustments (swings and tilts of the lens board and camera back) we used to control distortions in the subject image. When the point of prime focus was nearer to the camera, depth of field was less. This was of particular concern when the object being photographed was close to the camera, as in studio work on small electronic parts. The smaller the lens aperture, the greater the depth of field. I've seen in more recent years that the blur of out-of-focus objects in the distance behind a sharply-focused subject (as in a portrait in which the person is in sharp focus but objects behing are blurred) referred to as "bokeh." This term sounds as though it's maybe from the French, and seems much more elegant than simply calling the background out of focus.

angler Loc: StHelens England

Good fun one Snap Shot.

Snap Shot Loc: California

Thanks Jim! I'm glad to see not all of us are so serious!

Jim Plogger Loc: East Tennessee

Well, you certainly got them going this morning!!

CPR Loc: Nature Coast of Florida

To illustrate the Concept of Depth of Field it was a good idea but if you could have the top of the letters be in focus and gradually go to out of focus at the bottom it would help the illustration of the concept.

Snap Shot Loc: California

They're out in full bloom this time of year! Enjoyed reading all of them Jim! They just needed a little fertilizer to show their real colors... an amazing array!