Abstract: An interchangeable lens mount insert for lens adapters is positioned into a lens mount to prevent unwanted light from entering a camera lens and to allow for the attachment of nonstandard external lenses to the lens adapter. The interchangeable lens mount insert includes an aperture shroud, an aperture hole, a lens attachment mechanism, and a mount attachment mechanism. The aperture shroud obstructs the camera lens from unwanted light and debris, while the mount attachment mechanism provides a means for securing the aperture shroud to the lens mount. The aperture hole traverses the aperture shroud and allows a select amount of light to reach the camera lens. Meanwhile, the lens attachment mechanism provides a means for securing external lenses to the aperture shroud.