EOS extension tubes

As I mentioned the other day, 40mm and 80mm extension tubes with Canon EOS bayonet mount for Minolta MD Macro ROKKOR 100/4(already modified into Canon EOS bayonet mount) have completed. As commercially available iron steel COFFEE cans were utilized to form tube barrel, they are very light like nothing but enough strength and stiffness were obtained. The picture shows a comparison of 100/4 Macro lens on  ordinal 1/2 magnification with both two extension tubes together with 40mm and 80mm. These equipment would open a wonderful micro magnification world for me, in addition, a genuine Minolta Focusing Rail obtained last month would play a good part in close up situations in future. Micro Photographic transparencies would appear soon. Because an important anti-reflection walls with flocking non-reflective cloth were not prepared inside of the barrel, these wanton sporting would be done tomorrow.