Tiffen 4x4" Day for Night Monochrome Glass Filter

Tiffen 4x4" Day-for-Night filter - Day for night photography is an effect that makes a scene recorded in daylight appear as if it were taken at twilight.

This is usually accomplished by the use of a filter that both underexposes by about two stops, and can also produce a bluish color overcast. Lighting, contrast, and other factors contribute to the reality of this effect.