This is an NEX camera mounted pinhole lens. The mount potion of the lens was designed by NHFoley and can be found here: http://www.thingiverse.com/thing:133815 I designed the front half. It is sized to receive a pinhole lens built by Lenox Laser. The following link takes you to their page. http://www.lenoxlaser.com/index.php?dispatch=products.view&product_id=72 I went with the manufactured pinhole for the most precise pinhole lens that could be made, but could have easily made my own pinhole. With this part, and a 200 micron pinhole, the most accurate pinhole diameter vs distance to sensor is achieved for a 24mm (35mm equivalent) lens; Atleast according to the following calculator. http://www.mrpinhole.com/calcpinh.php I found the lens in quite sharp in terms of pinhole standards and have attached a few of the images I have taken with it. The design has been repaired in NetFABB for an acceptable Mesh. Hope this design works for you!