I have stored this lens in a dark place after using it a few times for events like sports day photography! I never experienced any problems when I was using it! Please purchase only if you understand this. This is a SIGMA macro lens with a focal length of 70-300mm and an aperture of F4-5.6. - Brand: SIGMA - Model Name: 70-300mm F4-5.6 DG MACRO - Focal Length: 70-300mm - Aperture: F4-5.6 - Macro Function: Yes - Lens Cap: Included With box Thank you for looking.