17 Oct
2007
17 Oct
'07
4:45 p.m.
Fred Cisin wrote:
Current "photography" teachers don't even know Scheimpflug's
principle.
Well what is it. The only thing I remeber is
'contrast' is needed to see.
I'm not a photographer, but...
Basically, it states that the object plane you want to be in sharp focus;
a plane through the optical centre of the lens, perpenicular to the
optical axis; and the image plane (where you put he film/CCD) all
intersect in a single line. (which might be 'at infinity' -- that is the
3 planes can be parallel).
It becomes useful when you use a camera with 'movements'. Most
large-format cameras and a few medium format cameras (OK and _one_ 35mm
camera to my knowledge) have the faciltiy to shift and tilt the lens and
fim back. You cna thus use this principle to get an apparently extended
depth of field
-tony