The Hoya YA3 Orange filter is built for black and white photography. It increases the contrast between reds and yellows. This is especially helpful for distant outdoor shots taken with a telephoto lens. For Color Photography: While this filter was designed for black & white photography, it can be used with color film to produce specific color effects. The YA3 is particularly useful in color landscape photography. HOYA Multi-Coat (HMC) filters are recommended for enhancing the performance of today’s multicoated lenses. These popular filters minimize reflection, reduce flare and ghosting, and result in over 97% average light transmission. Filter Factor: 1 1/3 stops Glass Type: Hoya Optical Number of Multi-Coatings: 6 layers / 3 per side Hardened Top Layer: No Anti-Static: No Frame Construction: Standard Profile / Aluminum Front Filter Threads: Yes