What is a Quan Huafu lens?

The so-called frame is the size of the negative film for the traditional film machine and the size of the photosensitive device for the digital camera. The traditional 135 film SLR camera used before used 35mm film with a frame size of 36mm×24mm. Because the film used by 135 camera is the predecessor of cinematographic film, and the width of cinematographic film (including upper and lower perforations) is 35mm, so this film used by camera is also called 35mm film. In the digital age, we call the 36mm×24mm film or photoreceptor a full-frame camera, and the lens that can be used in a full-frame camera belongs to Quan Huafu lens.

There are also lenses in APS-C format, APS-H format, DX format and 4/3 format, all of which are non-Quan Huafu lenses.

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