This is a thinner and stronger square filter system for shutterbugs. Its main body is made of aluminum alloy. The structure and quantity of parts have been simplified to improve overall reliability and strength. At the same time, the thickness of the main body has been kept to 10.5mm, which can reduce the generation of dark corners on the edges of the picture and minimize the storage volume. This is also the thinnest square filter system. When the integrated shading cover is opened, the CPL filter can be automatically lifted out to take out the filter.