Protective cap with internal nail attachment, which can be placed in front of the front lens of the objective. To open, the nails can be pressed not only at the edge, but there is also a finger rest inside for this purpose, so the protective cap can be removed and put on conveniently even with the sunshade in place. We get a string with a rubber ring, which can be used to attach the protective cap to the lens tube or to another place. An effective solution against loss.