Hoya Blue Intensifier Filter for Sky & Seascape Photos protection It was originally created for

It was originally created for film photographers to "intensify" warm fall colors on overcast and cloudy days

Filter Factor: 2 Glass Type: Hoya Optical Number of Multi-Coatings: 6 total / 3 each side Hardened Top Layer: No Anti-Static: No Frame Construction: Standard Profile / Aluminum Front Filter Threads: Yes

Hoya color conversion filters are manufactured in Japan using hand-selected silicates that are carefully smelted and blended to yield high-performance optical glass

Filter Factor: Zero Glass Type: Schott B270 Light Transmission: 98

You are shooting in overcast conditions and there is a blue color cast

Hoya Blue Intensifier Filter for Sky & Seascape Photos protection It was originally created forDescription The Hoya Blue Field Intensifier filter enhances colors in the blue region of the spectrum without adversely affecting other colors. The Blue Field Intensifier filter is useful when: Improving brightness in seascapes In combination use with HD3 UV or HD3 Circular Polarizer to increase contrast and sharpness When a polarizing filter isnt effective because of the direction of the sun Specifications Filter Factor: 2. 5 Glass Type: Hoya Optical