SIGMA APO 170-500mm F5-6.3 Telephoto Zoom Lens This lens is for Canon EF mount. The exterior is very clean and has been handled with care. However, **balsam separation (delamination of the cemented surfaces) is confirmed inside the lens.** When light is shone through, a rainbow-colored blur and streaks can be seen. There are no scratches or mold on the front or rear lens surfaces, and there is little dust. However, since the impact on the shooting results is unknown, it is treated as a junk item. 【Condition】 ・Exterior: Good (few scratches/scuffs) ・Lens: Balsam separation present (optical defect) ・Dust/Mold: Not visible ・Operation: Unconfirmed (as-is) 【Accessories】 ・Lens hood ・Front and rear caps (with Canon markings) ・Dedicated case (SIGMA genuine, good condition) 【Additional Information】 Although the exterior is in very clean condition, due to the optical issues, this lens is intended for those who want to repair it, use it for parts, or collect it, rather than for taking pictures. It will be delivered as-is, and returns or refunds are not accepted. This lens is for Canon EF mount (non-DG, early model). It can be mounted on digital SLR cameras (EOS series) that support EF mount. It is compatible with full-frame (EOS 5D, 6D, etc.) and APS-C (EOS 90D, Kiss series, etc.). Also, with mirrorless cameras (EOS R series, etc.), you can use it with the "EF-EOS R mount adapter." However, since it is a non-DG type, it does not have digital-compatible coating, and flare and ghosting tend to occur under strong backlight conditions. Also, due to the communication specifications unique to old SIGMA lenses, an **aperture control error (Err01)** may occur with newer EOS bodies (R7, R10, R6, R5, etc.). In that case, we recommend using manual focus (MF). We have paid close attention to the description, but there may be oversights. Please ask any questions you may have before purchasing. We will also respond to requests for additional photos. Focal length (wide side): 151-200mm Focal length (telephoto side): 401-500mm Open F-value: 5.7~ Other features: Junk, with lens hood, with front lens cap, with rear lens cap