I am selling this because I bought it here but can't use it. I took one test shot with an OLYMPUS PEN. I will quote the images and description from when I purchased it. This is a telephoto lens that is useful in a wide range of situations, such as children's sports days, watching baseball games, and weddings! It is a set of 4 items: the lens, front cap, rear cap, and conversion adapter. It is a 100-300mm lens (200-600mm equivalent in full-frame) that can be used with Micro Four Thirds. This product allows you to use a K-mount lens with Micro Four Thirds, so you can use it immediately after delivery! The brand is Olympus, which is the main brand for Micro Four Thirds, but it is made by SIGMA. There are no cracks, mold, or fogging on the lens, but there is some minor dust and dirt, but it is not a problem for shooting. G VARIO 100-300mm/F4.0-5.6 /MEGA O.I.S. I think it can cover the same range as H-FS100300 and Olympus M.ZUIKO DIGITAL ED 75-300mm II. Please check the images when purchasing. You can use it with the following OLYMPUS and Panasonic Micro Four Thirds mirrorless single-lens reflex cameras. OLYMPUS PEN E-P1 OLYMPUS PEN E-P2 OLYMPUS PEN E-P3 OLYMPUS PEN E-PL1 OLYMPUS PEN E-PL1s OLYMPUS PEN E-PL2 OLYMPUS PEN E-PL3 OLYMPUS PEN mini E-PM1 OLYMPUS PEN Lite E-PL5 OLYMPUS PEN mini E-PM2 OLYMPUS PEN E-P5 OLYMPUS PEN PEN Lite E-PL6 OLYMPUS PEN Lite E-PL7 OLYMPUS PEN F OLYMPUS PEN Lite E-PL8 OLYMPUS PEN Lite E-PL9 PEN Lite E-PL10 OM-D10 gf9 gf7 DMC GM1 GM5 etc. Focal length 201-300