Leitz M-Summilux 50mm/1.4/2nd modification

My favorite equipment for photo shooting is here, Leitz M-Summilux 50mm/1.4/2nd generation on SONY α-9 by way of E-mount. It is true that Leica M lenses are utilizable on E-mount, but as a matter for reglet, most of M lenses are so made to adopt on range finder designed for minimum closing distance at 1m with exception such as Summicron for 70cm. Most of the photographes must feel some inconvenience whenever he or she might try close-up shooting within 1m and 1/12 magnification. On the other hand, recent standard lenses have the capability to come closer to 45 cm and 1/6 for DSL and DSLR bodies. This point is the most unacceptable for the photographers who intend to put M lenses on Mirror-less Digital cameras. In addition, 8mm thickness mount adapter do not have enough space to form helicoid construction inside including mechanical backlashes.
In the difficult consideration with every door closed if continued the original M-mount and helicoid mechanism, I have realized that no way is left when insist on the upper Leica original mechanical constructions, the only way to see a brilliant light is just replacing lens barrel case thoroughly into another one satisfying close-up shooting requirement. Consequently, I have selected the most suitable standard lens that often appears at 1 yen in Yahoo Auction, of course lens surfaces are irreversibly invaded by mold colony. KONICA HEXANON 52mm/1.8 produced around 1970 was selected as a donor with enough room for the rear glass. Later maintenance on this lens module proved it's possible to survive again like a Phoenix, as I have another 52mm, this lens unit is worth keeping.
Keeping Summilux lens unit precisely vertically onto new lens case with accurate centricity is an absolute condition that cannot be handed over. The angular stopping mechanism in the new barrell case was so modified to obtain maximum movement by grinding it as less as possible, thanks for this effort, minimum distance 370mm and 1/5 close-up shooting could be attained.
But for Room temp. polymerizing resin material, this kind of fine work being requiring ultimate precision. Screw in&out rotation of Summilux
lens unit makes it possible to be interchangeable between an original helicoid case & new one each other, even a small part of Leica lens is not modified at all. Leica M-Summilux 50mm/1.4 /2nd generation was modified as that should be what it should be if put on DSL camera body with unusually sweat a lot, direct E-mounting without mount adapter leading to less mechanical backlash.
Hope that has been stuck for half a century on Summilux has realized!
Spherical aberration correction on this lens is outstandingly different, S shape curve inverts between 1.4 and 2.0, no other lens including those for larger format does not have the same. Probably, this correction has much to do with the resolution of Atmosphere. This is why I insist only on this Leica Summilux 50mm/1.4/ 2nd generation.
Though I recommend the performance of Zeiss Plannar 50mm/1.4 as most of the photographer does, I dare prefer Mandler's work to Plannar.