Product Description
HOYA HMC 25A 77mm Deep Red Photographic Filter
This is a professional 77mm deep red filter from HOYA, part of their high-performance HMC (Multi-Coated) series. The 25A designation indicates a specific deep red wavelength transmission, making it a powerful tool for creative photography, scientific applications, and dramatic black & white imagery.
Key Features & Specifications:
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Diameter: 77 mm (threads onto 77mm lens filter threads)
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Type: 25A Deep Red Color Filter
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Coating: HOYA HMC (High-performance Multi-Coating) for reduced reflections
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Effect: Strongly transmits red wavelengths while blocking most blue and green.
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Construction: Optical glass with durable aluminum ring
Common Uses:
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Black & White Photography: Creates extreme contrast—skies turn near-black, red subjects are dramatically lightened. Classic for dramatic landscapes.
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Creative Color Photography: Produces strong red color casts and surreal effects.
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Scientific/Technical: Infrared photography prep (with IR-sensitive sensors), fluorescence imaging, or specific wavelength isolation in lab setups.
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Videography: For stylistic or corrective color grading.



