Optical Filter Spectral Tolerance Explained
A filter described as “850 nm,” “550 nm longpass,” or “10 nm bandpass” is not fully specified by those nominal numbers alone. Real optical filters…
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Filters & Coatings
This is the GIAI past corporate news section, which brings together various activities and exhibitions that GIAI has participated in, the latest industry communication trends, corporate notifications, holiday details, etc. You are welcome to read!optical filters, optical coatings, interference filters, bandpass filters, longpass filters, shortpass filters, AR coatings
NIR Bandpass Filter for Machine Vision: Selection Guide
A machine vision system may use an 850 nm or 940 nm LED, a monochrome camera with good near-infrared sensitivity, and stable exposure settings—yet still…
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What Is Edge Steepness in an Optical Filter?
what is edge steepness in an optical filter Edge steepness describes how quickly an optical filter transitions between its passband and its blocking region. It…
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Protected Aluminum vs Enhanced Aluminum Mirror Coatings
Protected aluminum and enhanced aluminum start from the same vacuum-deposited aluminum film. The difference is what goes on top: protected aluminum adds a single dielectric…
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Narrow Bandpass Filter Manufacturer: How to Specify
Choosing a narrow bandpass filter manufacturer comes down to three questions: can their coating process hold your center wavelength tolerance across the full clear aperture,…
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Custom Optics Manufacturer in China: Engineering Evaluation Guide
Searching for a custom optics manufacturer in China usually means the optical function is already known, a drawing exists, or a prototype needs to be…
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How to Choose an Optical Filter for Machine Vision
To choose an optical filter for machine vision, start from the illumination spectrum rather than the filter catalog. Match the filter passband to the light…
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Telecentric F-Theta Lens vs Standard F-Theta Lens
Telecentric F-Theta Lens vs Standard F-Theta Lens: Engineering Differences and Selection A telecentric F-theta lens vs standard F-theta lens comparison is mainly a question of…
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F-Theta Distortion vs Field Curvature in Scan Lenses
F-theta distortion and field curvature are both field-dependent errors in a laser scan lens, but they fail in completely different ways. F-theta distortion is a…
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F-Theta Lens Spot Size vs Beam Diameter
In an f-theta scanning system, spot size and input beam diameter are inversely related: double the collimated beam diameter at the lens, and the focused…
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Fluorescence Filter Set Design Basics
A fluorescence filter set is three components engineered as one spectral system: an excitation filter (exciter) that cleans up the illumination, a dichroic beamsplitter that…
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Aspheric Lens vs Spherical Lens
The central difference in an aspheric lens vs spherical lens comparison is surface geometry. A spherical surface has a constant radius of curvature, while an…
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