Ancient Leitz lens before Leica 35mm, Summar 12cm f/4,5 is the macro and close up purposed also developing usage. I did modified to adopt to 67 format with DIY adapter manufacturing including helicoid mechanisms. Hektor 125mm for portrate lens is also interchangeable, in addition, as the lens itself has helicoid construction on the frontal part so the double helicoid system is established leading to the capability to closer up than original design. The interchangeability to 645 format is established on both lenses, adapter systems are so designed.
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