This is a set of four Kenko 49mm filters in a carrying case. These filters were used frequently, so they show considerable signs of use. All four filters have minor dust-like blemishes due to coating degradation, but I believe they will have little to no effect on image quality. The set includes the following: 1. Center Focus This filter has a hole in the center of the convex lens, creating a soft effect through double images of virtual and real images. The center area achieves sharp focus, while creating a unique "bokeh" effect around the edges of the frame. 2. Polarizing PL This filter has a structure where a polarizing film is sandwiched between two pieces of glass. By rotating the filter, you can cut out polarized light caused by reflections on water surfaces, etc. 3. Duet This is the softest of the soft filters, and is ideal for portrait photography using a medium telephoto lens. The soft effect is achieved through a pattern applied to the glass surface, so it is not suitable for wide-angle lenses or shooting with a small aperture. 4. LBW4 This filter corrects the bluish cast that occurs in shadows or on cloudy days, resulting in natural colors. In film photography, there is no "white balance" function like in digital cameras, so you need to adjust the color tone with filters. Sample images in the order of the above numbers are included at the end of the product images, so please refer to them.