A blue lens filter can be used to adjust the colour temperature of an image by adding a blue tint to the scene. This can be useful in situations where the lighting is too warm, such as when shooting indoors under incandescent lighting. The filter works by blocking out certain wavelengths of light, which can help to balance the colour temperature of the image and create a more natural-looking result.
In addition to adjusting the colour temperature of the image, a blue lens filter can also be used to create a specific mood or effect. For example, a blue filter can be used to create a cool, calming effect in a landscape photo, or to create a moody, dramatic effect in a portrait.
