Hoya 55mm Starscape RA54 Red Enhancer, Color Intensifier Filter

This 55mm Starscape RA54 Red Enhancer Color, Intensifier Filter from Hoya is designed increase color contrast within an image without unwanted polarization. It is intended to affect specific colors of the visible spectrum passing through it, with an emphasis on wavelengths of light that are responsible for the appearance of red and orange. White and neutral tones are preserved, and this filter's 0.15 density corresponds to a reduction of light from entering a lens by one-half of a stop.