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Fujifilm filed a patent for a new polarization interference element and filter designed to minimize wavelength shift when light hits the sensor at an oblique angle. This technology appears to be aimed at correcting color shading (color casts) in the corners of the frame, which is particularly useful for wide-angle lenses and high-resolution sensors.
Overview
- [Publication number] US 2025/0362439
- [Release date] 2025-11-27
- [Title of invention] Polarization Interference Element and Filter
- [Applicant] FUJIFILM Corporation
Problem to be solved “To provide a polarization interference element and a filter that can minimize wavelength shift at maximum transmittance when light is incident at an oblique angle. Conventionally, wide-angle optical systems suffer from color unevenness in the peripheral portion of the image due to the dependence of the spectral transmittance on the incident angle.”
Benefits This technology addresses the “crosstalk” and color shifting often seen when using ultra-wide lenses or adapted glass on mirrorless sensors. By using multiple birefringent layers to correct the optical path at steep angles, this implementation could lead to:
- Improved Corner Accuracy: Eliminating the color shift (magenta/green casts) often seen in the extreme corners of wide-angle shots.
- Better Adapted Lens Performance: Helping legacy rangefinder lenses perform better on X-Series and GFX sensors.
- Cleaner Video: Reducing color gradation shifts during pans, which are difficult to correct in post-production.
via justia
