It can be used in many situations such as architecture where certain building features need emphasizing, or for landscapes to enhance foliage and rocky features. Use the Hoya Intensifier in combination with a Circular Polarizer such as the HD3 Cir-PL for incredibly saturated autumn colors. The filter is also very useful for filtering out some of the light pollution in astro/astrolandscape photography. The Hoya Intensifier suppresses a band of wavelengths that coincides with the wavelength of light that a lot of mercury vapor lights (most common street lamp light) emits. Street lighting is the largest generator of light pollution. By suppressing these wavelengths the resulting color balance is more accurate and easier to adjust in software later. This Hoya filter is constructed from optical glass for increased clarity and features an aluminum-alloy filter ring for durability while remaining lightweight.