Submitted for the April Scavenger Hunt Challenge.


Onde is French for wave. In this case the waves are
infrared (IR). The eye is an amazing instrument. It
can see light/color in the visible spectrum (420nm -
780nm). Below that is the invisible spectrum that we
all worry about when in the sun for long periods of
time (ultraviolet)with shorter and shorter wave lengths.
Above that is the spectrum known as infrared which has
wave lengths increasing upward of 800nm (this kicks in
at around 750nm and shoots up to about 1150nm (for our
photographic purposes. The actual IR spectrum goes on
up to 2500nm in the Near-infrared range, 10,000nm when
we move into the Mid-infrared range and 1mm (30GHz) in
the Far-infrared range. Blah dee blah blah blah ;-)

The use of filters allows us to see in photography
this amazing and unique range of light. In this case
the filter is an internal 715nm filter replacing the
infrared blocking filter that comes standard in front
of the sensor of digital cameras. This amazing filter
allows the photographer to shoot hand held without the
loss of many of the functions of the camera that the
external lens mounted IR filters don't allow.