The Cokin B1 Hard-Edge Graduated Blue is a professional-grade 1 2/3-stop colour filter designed to enhance dull, flat, or hazy skies. It features a hard-edged transition line that graduates from densest at the edge to clear at the middle, making it ideal for landscape photography with defined horizon lines. Manufactured from optical resin CR39 material and compatible with the Cokin P-Series filter holder system, this rectangular filter gives you precise control over where the blue enhancement is applied within your composition.

• 1 2/3-stop (0.5 density) graduated blue filter for sky enhancement
• Hard-edged design with sharp transition line for defined horizons
• Optical resin CR39 construction for superior optical quality
• Cokin P-Series rectangular format for selective framing control
• Filter factor 1.3-2 for accurate exposure metering