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Servicing Zeiss Opton Biogon 35/2.8 (Contax II)


 

Dear all,

I need to access the two rear elements of my Zeiss Opton Biogon 35/2.8 (Contax II mount). I removed as much as I could from behind, but I do not see what would be the next steps. None of the different parts numbered from 1 to 6 on this photo can be moved:



Someone has any idea or exerience how to remove the rear lens?

Thank you.

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