As you know , I am brute forcing to make my lens. I found a excellent design from zeiss which most important part could be manufactured with telescope mirror making method. I contacted with a glass selling company which will help me to find help from schott glass makers. I think a piece of lak 7 will work for it. How can we make it easier to manufacture ? Is it possible to use fron element alone or with a ready made achromat or zeiss aspherical ready lens ? Just look its drawing , its willy merte 1935 design.