<p>Hey guys,<br> I have an old voigtlander petzval lens. I got it for a great price, because the front element on it was cracked through the center. the front element is a doublet and I managed to remove the cracked front element under a heat source. does anyone know of a Optical glass manufacturer that is able to make a Bi-Convex lens element? </p> <p>THANKS!</p>