42 Spyder2 4k User’s Manual
03-032-10195-04 DALSA
4.2 Optical Interface
Depending upon resolution the cameras can be ordered with different lens mounts. The
following table provides this information.
Lens Mounts
Camera
Configuration
Available Lens Mount
Options
4K, 2 Tap No mount and F mount and
M72x0.75
All F mount adapters have the appropriate back focal distance for the lens type being
used. Ensure that the image circle diameter of the lens to be used is as great as the length
of the imaging region. The following table provides information regarding the lens mount
used and the back focal distance. The M72x0.75 lens adapter originated from the high-end
photography standard. Distances to its inner flat surface and the outer flat surface are
provided.
Mount Back Focal Distance (sensor die to
adapter)
F Mount 46.5 ±0.18 mm
M72x0.75 19.55 mm (nominal)—outer flat surface
Detailed mechanicals, including front plate opening sizes, and the distance from the
sensor die to the opening, can be found in section 4.1 Mechanical Interface.
Illumination
The amount and wavelengths of light required to capture useful images depend on the
particular application. Factors include the nature, speed, and spectral characteristics of
objects being imaged, exposure times, light source characteristics, environmental and
acquisition system specifics, and more. DALSA’s web site, vfm.dalsa.com, provides an
introduction to this potentially complicated issue. See “Radiometry and Photo
Responsivity” and "Sensitivities in Photometric Units" in the CCD Technology Primer
found under the Application Support link.
It is often more important to consider exposure than illumination. The total amount of
energy (which is related to the total number of photons reaching the sensor) is more
important than the rate at which it arrives. For example, 5μJ/cm
2
can be achieved by
exposing 5mW/cm
2
for 1ms just the same as exposing an intensity of 5W/cm
2
for 1μs.
Light Sources
Keep these guidelines in mind when setting up your light source.
• 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 with
excellent sensitivity, such as DALSA’s Spdyer2 4K camera.
• Halogen light sources generally provide very little blue relative to IR.
• Fiber-optic light distribution systems generally transmit very little blue relative to IR.
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