Dichroic filters are optical filters created by applying precise metallic coatings to glass surfaces, which produce colours through the interference of light. Unlike standard coloured filters that absorb light, dichroic filters selectively reflect certain wavelengths while transmitting others, resulting in highly accurate and vibrant colour effects.
In photography, dichroic filters are commonly used in high-quality colour enlarger heads, studio lighting, and projection systems. They allow photographers and printers to achieve precise colour control and consistency, making them essential for professional darkroom work, fine art printing, and situations where colour fidelity is critical.