Lens Mounts; Optical Interface - Dalsa Stop Action 4M30 User Manual

48

4.2 Lens Mounts

M42
F-Mount
C-Mount
Note that the use
sensor.

4.3 Optical Interface

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,
provides an introduction to this potentially complicated issue. See
Photo Responsivity" and "Sensitivities in Photometric Units" in the
Primer found under the Application Support link.
It is often more
energy (which is related to the total number of ph
important than the rate at which it arrives. For example, 5µJ/cm
exposing 5mW/cm
Light Sources
Keep these guidelines in mind when setting up your light source:
•
•
•
•
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-
03-32-10121-09
PRELIMINARY
6.56±0.25mm
46.50 ±0.25mm
17.52±0.25mm
of a C-Mount lens will cause vignetting due to the size of the image
important to consider exposure than illumination. The total amount of
for 1ms just the same as exposing an intensity of
2
LED light sources 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.
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
not be uniform—a light source may produce progressively less light in some areas of
the spectrum but not others.
e the nature, speed, and spectral characteristics of
http:/
otons reaching the sensor) is more
4M Stop Action Camera Manual
ages depend on the
nvironmental and
/vfm.dalsa.com/,
"Radiometry and
CCD Technology
can be achieved by
2
5W/cm for 1µs.
2
h
IR.
tle blue relative to IR.
t. This aging may
DALSA