Modified Elmar 50/3.5 on APSC

In order to utilize on Elmar 50mm/3.5 old lens, Leitz original hood for Elmar 35mm/3.5 required more 42 mm extension for enough halation cutting under the condition of APSC image use. The extension length is defined under the condition of the barrel position of infinity and the iris is closed utmost.
My DIY work does not look so good but not so bad, but enough effect it has at all as shown in a picture, the quality of a pic is not second to ordinary 50 mm standard lens designed with Gaussian construction.
Also this Elmar has more potential to close up shooting to 1:5 ratio by extended barrel though illegal original use as this is.