Hoya RA54 Red Enhancer 82mm Filter StarscapeEnhance Reds and Oranges with the Hoya RA54 Red Enhancer Filter The Hoya 82mm RA54 Red Enhancer Filter, also known as a "didymium" filter, intensifies red, orange, and brown tones in your images, increasing color saturation and contrast while minimally affecting other colors. Ideal for architecture and landscape photography. Brand: Hoya Model: RA54 Red Enhancer Size: 82mm Filter Type: Enhancing Filter Filter Factor: 1. 4 (0. 5 stop) Density: 0. 15