"Nobody is going to throw away their night vision goggles because of the poor depth of field
, but the full promise of night vision isn't realized until this problem is overcome," James said.
The basic concept is simple: take several standard shots having low depth of field
, each at a different focus level, then combine them into one image that adds up all the in-focus slices and discards the out-of-focus portions.
As an example of determining depth of field
, first find the hyperfocal distance H for the 75-mm lens
That way, when the depth of field
changes, the picture won't blur while the camera decides what object to focus on.
The depth of field
, and sometimes lack thereof, in the photographs reflects the disposition of the era.
The effect of the SEMs finite depth of field
was modeled by varying the convergence angle of the incident electron beam.
Information on choosing a camera, film options, the mystery of focal length and depth of field
, photography from televised images, capturing movement, and many other topics are addressed in double-page spreads.
Looking through a small pinhole increases the eye's depth of field
and sharpens the vision.
The actual range of distance in which the picture is sufficiently in focus to be useful is called depth of field
. Depth of field
increases as available light increases.
In addition the accelerator features 3dfx's proprietary T-buffer digital cinematic effects which enable acceleration of Hollywood style techniques including motion blur, depth of field
, soft shadows and soft reflections.
Unlike most pop recordings that seem absolutely studio-bound, this one actually has a depth of field
and a homogeneity of players and instruments that suggest a live experience.
For high-magnification work, a more shallow etch depth is desired due to the more limited depth of field
of the light microscope, while for low-magnification examination a deeper contrast etch is best.