Traditional Culture Encyclopedia - Photography major - What's the name of the lens in front of the lens?

What's the name of the lens in front of the lens?

Filter. Lens refers to the optical components used by movie cameras and projectors to produce images. The lens in front of it is called a filter, which can achieve a certain degree of close-range (macro) photography effect. Filters are used to decorate and artistic picture effects and realize various special effects of images.