The Heliopan 77mm KB 15 (80A) Camera Lens Filter corrects color balance when using daylight film under artificial lighting, like halogen bulbs. It reduces the yellowish tint common in indoor photos, restoring natural skin tones and colors. Made with high-quality glass and a slim, durable black anodized brass frame, this filter fits 77mm lenses without causing vignetting. Ideal for photographers who want accurate color and image clarity in mixed lighting conditions.