For more contrast and color saturation: The Red Enhancer, also known as a Didymium filter or Intensifier, enhances contrast and boosts color saturation through its special color properties. It particularly benefits red, orange, and brown hues. The advantage is that the use of this filter has little impact on other colors. Therefore, this color filter is especially suitable for architecture when it comes to emphasizing specific areas. Naturally, using the Hoya Red Enhancer is highly recommended for autumn foliage or rocky environments.