I have 2 complete lens groups for the Takumar 50mm 1.4 lens (screwmount type). One has the aperture blades and in the other they've been removed. Glass is great in one, close to great in the other (tiny marks on the front element). If you have a lens with so-so glass or poor glass or if you want to sun bleach the rear (yellowed) element, this could be just what you need. $9 plus the cost of mailing. If you want a pic, please let me know.