You are welcome, I am relieved to see my measurement agrees with that Japanese chart! If you are going to build your own attachment, the use of a body cap to mount the lens might be useful. The pinhole adapter I made can be seen here, it would probably be possible to use some plastic pipe fittings to create a crude lens mount. You do have to avoid anything that extends inside the camera body very far, as it could hit the mirror.
Originally Posted by romunas