PRELIMINARY
4M Stop Action Camera Manual
48
4.2 Lens Mounts
M42
6.56±0.25mm
F-Mount
46.50 ±0.25mm
C-Mount
17.52±0.25mm
Note that the use
sensor.
of a C-Mount lens will cause vignetting due to the size of the image
4.3 Optical Interface
ages depend on the
e the nature, speed, and spectral characteristics of
nvironmental and
/vfm.dalsa.com/
,
“Radiometry and
CCD Technology
Primer found under the Application Support link.
important to consider exposure than illumination. The total amount of
otons reaching the sensor) is more
be achieved by
5W/cm
2
for 1
µ
s.
are relatively inexpensive, provide a uniform field, and longer life
span compared to other light sources. However, they also require a camera wit
excellent sensitivity.
IR.
tle blue relative to IR.
t. This aging may
not be uniform—a light source may produce progressively less light in some areas of
the spectrum but not others.
Filters
Digital cameras are extremely responsive to infrared (IR) wavelengths of light. To prevent
infrared from distorting the images you scan, use a “hot mirror” or IR cutoff filter that
transmits visible wavelengths but does not transmit wavelengths over 750nm. Examples
are the Schneider Optics™ B+W 489, which includes a mounting ring, the CORION™ LS-
Illumination
The amount and wavelengths of light required to capture useful im
particular application. Factors includ
objects being imaged, exposure times, light source characteristics, e
acquisition system specifics, and more. DALSA’s Web site,
http:/
provides an introduction to this potentially complicated issue. See
Photo Responsivity” and "Sensitivities in Photometric Units" in the
It is often more
energy (which is related to the total number of ph
important than the rate at which it arrives. For example, 5
µ
J/cm
2
can
exposing 5mW/cm
2
for 1ms just the same as exposing an intensity of
Light Sources
h
Keep these guidelines in mind when setting up your light source:
•
LED light sources
•
Halogen light sources generally provide very little blue relative to
•
Fiber-optic light distribution systems generally transmit very lit
•
Some light sources age; over their life span they produce less ligh
03-32-10121-09
DALSA
