Kowa-Cameras-Lenses-Catalogue-2024-KODE - Flipbook - Page 91
Distortion
Distortion is a phenomenon where the captured image appears warped or
deformed. When distortion is present, the shape of the imaged object may
di昀昀er from its actual shape, leading to inaccuracies in position or dimensional information during inspections or image processing. For this reason,
low-distortion lenses are essential in applications that require high precision, as they maintain accurate image geometry and ensure reliable measurement results.
Object
Pincushion Type Distortion
Barrel Type Distortion
Resolving Power
Resolving power refers to the lens’s ability to reproduce the fine details and
edges of an object clearly. It is typically measured using black and white striped
patterns, and is expressed as the number of line pairs that can be distinguished
within a 1 mm width. This value is indicated in lp/mm (line pairs per millimeter), where a higher number represents greater detail resolution.
Floating Mechanism Design
Lens Movement
Floating mechanisms, also known as close-range aberration compensating mechanisms, are e昀昀ective in minimizing performance degradation across varying working distances.
In conventional lenses, all lens elements move together when adjusting
focus. This often results in a decline in optical performance depending
on the working distance.
In contrast, lenses equipped with 昀氀oating mechanisms divide internal
lens elements into multiple groups. These groups move independently,
allowing the lens to maintain optimal performance across a range of
working distances. As a result, 昀氀oating mechanisms enable lenses to
deliver consistently high image quality, even during close-range
imaging.
Variation in Performance
Performance
Normal Lens
With
Floating
Mechanism
Without
Floating
Mechanism
Initial Position
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Distance
Assumed Design Value to Object
Floating
Lens Coatings
-High transmission from the visible range to
short wavelength infrared (SWIR).
-A wide range of wavelength bands.
Wide-Band Multi-Coating
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EX Wide-Band Multi-Coating
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LM�HC-VIS-SW Transmission
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transmission (%)
transmission (%)
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Wavelength (nm)
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Near Infrared (NIR)
Visible Light
SWIR Coating
Wavelength (nm)
Wavelength (nm)
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-Coatings optimized for high transmission
in the short wavelength infrared (SWIR) range.
transmission (%)
-High light transmission from visible to
near-infrared (NIR) wavelengths.
-Can be used in a wide range of applications.
For each lens series,
coatings are optimized
to suit the specific needs
of various wavelength
bands, ensuring they are
ideally suited for a wide
range of applications.
���� Wavelength (nm)
Short Wavelength Infrared (SWIR)
Near Infrared Light
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