530nm Bandpass Filter

530nm light falls in the green region of the visible spectrum, known for its balance between visibility and reduced interference from other wavelengths in many optical setups.

  • Application 1: In fluorescence microscopy, to isolate green fluorescent protein (GFP) emission by blocking unwanted excitation light and allowing only 530nm light to pass, enhancing image contrast and reducing background noise.
  • Application 2: In botanical research, to analyze plant pigment absorption/reflectance by filtering 530nm light for precise measurement of chlorophyll fluorescence under controlled lighting conditions.
  • Application 3: In industrial color sorting systems, to detect specific green-tinted materials or defects by ensuring only 530nm light is captured, improving the accuracy of automated quality control processes.
530nm Bandpass Filter
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Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)

Filter

Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)
US5646781A - Color enhancement filter

US5646781A - Color enhancement filter

Context: This patent describes a multi-band interference coating (marketed as SpectraPLUS™) designed for color imaging systems like video cameras, digital projectors, and film.

Usage of Filter: The 530nm bandpass filter is used as the primary green transmission channel in a triple-bandpass structure (transmitting at 450nm, 530nm, and 650nm).

Function: It selectively transmits the "pure" green portion of the spectrum while blocking the "crossover" wavelengths (around 490nm and 590nm) where the human eye's response to red, green, and blue overlaps and causes color confusion.

Result: The system achieves significantly enhanced color saturation, purity, and signal-to-noise ratio by eliminating the "muddy" spectral regions between the primary colors.

US4826286A - Filter with three-band transmission for good seeing

US4826286A - Filter with three-band transmission for good seeing

Context: This patent relates to optical filters used in viewing systems, likely for military or high-performance observational contexts (assigned to Litton Systems).

Usage of Filter: A 530nm bandpass component is used as the middle transmission band in a filter that also passes 450nm (blue) and 610nm (red).

Function: The filter is tuned to match the peak sensitivity of the human eye (photopic response) while providing distinct color separation. The 530nm band specifically captures the peak brightness sensitivity of the eye.

Result: The user achieves improved visual clarity and color discrimination in difficult lighting conditions, maintaining natural color perception while blocking interfering wavelengths.

US7006141B2 - Video camera lens system

US7006141B2 - Video camera lens system

Context: This patent (assigned to Panavision) describes a high-end lens system for digital cinematography that incorporates specific color-correcting optics.

Usage of Filter: The 530nm bandpass filter (citing the technology from US5646781A) is used as an internal spectral correction element within the camera lens assembly.

Function: It shapes the spectral input reaching the camera sensor to match the "ideal" color gamut, specifically isolating the green channel at 530nm to prevent spectral crosstalk from cyan or yellow light sources.

Result: The lens delivers cinematic color reproduction that mimics high-quality film stock, with sharper contrast and reduced chromatic aberration.

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