A very high standard and rare ( black paint version only 1146 units ) Kern Macro Switar 50 1.8 AR. APO military . design and made in Switzerland . With original hood and LM coupling adaptor. One of the best standard Len . Test in both Macro and standard range by M9P. Len only w original hood , LM coupling adaptor , back cover and filter

https://zhuanlan.zhihu.com/p/117940816

https://www.orange-chansir.com/kern-macro-switar-11-8-50-ar-for-alpa/

https://oldlens.jp/macroswitar50mmf18/

https://tahusa.co/lens-review/alpa-kern-macro-switar-ar-50mm-f19/