This is a small-diameter PL filter that attaches to the "hot shoe" of film cameras, mirrorless cameras, etc. A long-selling product, the "PL Finder[R]", allows you to check the PL effect in advance. Even when the PL effect is difficult to see with a mirrorless camera or SLR camera that uses an LCD monitor for shooting, or when the effect is difficult to see with a dark zoom lens, you can check the effect in advance with this "PL Finder[R]". By matching the angle of the "▲" mark on the finder with the "▲" or "・" mark on the filter, you can achieve the same effect. It is also equipped with a scale compatible with "Circular PL(W) Vernier". Useful when the PL effect is difficult to see with a dark zoom lens, and for mirrorless cameras that use an LCD monitor for shooting where the PL effect is difficult to see. *Some Sony or Konica Minolta cameras require the genuine adapter "ADP-AMA" for installation. Size: W34 x H39.8 x D15mm Weight: 16g This product is difficult to obtain as it is already discontinued. It is useful for mirrorless cameras that do not have a viewfinder. It is a used item, but it is almost unused. I think the exterior is very clean. Only the main body and the dedicated case are included.