Olympus DE-P3 camera lens adapter

Diopter-Correcting Eye Cup DE-P3 (for positive correction extension) The DE-P3 provides diopter extension in the positive direction by shifting the diopter by +3m-1. When installed on the viewfinder eyepiece, the diopter can be extended up to +4m-1 so that even farsighted users can see the viewfinder images clearly. The DE-P3 is a large-sized eye cup with an easy-to-attach/detach slide-in type mechanism. To help screen out extraneous light (including sunlight) the cup is made of a soft rubber material that is comfortable and eye-friendly.