122
•
Additional Reference Information
Genie Nano-
CXP Series™
The following figure shows the lens image circles relative to Genie Nano-CXP models using the
Teledyne E2V Emerald 37.7M (Four Thirds image sensor format) and 67.1M (APS-C image sensor
format) sensors.
28.96mm minimum
Image Circle
Model 6200
Model 8200
21.72mm minimum
Image Circle
Additional Lens Parameters (application-specific)
There are other lens parameters that are chosen to meet the needs of the vision application. These
parameters are independent of the Nano model (assuming that the Lens Mount and Lens Sensor
Size parameters are correct, as previously covered in this section). A vision system integrator or
lens specialist should be consulted when choosing lenses since there is a trade-off between the
best lenses and cost. An abridged list of lens parameters follows
–
all of which need to be matched
to the application.
•
Focal Length
: Defines the focus point of light from infinity. This parameter is related to the
Nano mount (C or CS mount).
•
Field of View
: A lens is designed to image objects at some limited distance range, at some
positive or negative magnification. This defines the field of view.
•
F-Number (aperture)
: The lens aperture defines the amount of light that can pass. Lenses
may have fixed or variable apertures. Additionally the lens aperture affects Depth of Field
which defines the distance range which is in focus when the lens is focus at some specific
distance.
•
Image Resolution and Distortion
: A general definition of image quality. A lens with poor
resolution seems to never be in focus when used to image fine details.
•
Aberrations (defect, chromatic, spherical)
: Aberrations are specific types of lens faults
affecting resolution and distortion. Lens surface defects or glass faults distort all light or
specific colors. Aberrations are typically more visible when imaging fine details.
•
Spatial Distortions
: Describes non-linear lens distortions across the field of view. Such
distortion limits the accuracy of measurements made with that lens.
Содержание Genie Nano-CXP
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