It appears that the Zeiss 80mm f/2 for Contax 645 has 72mm filter threads. If you just need basic protection for the threads and lens front, as well as "some" contra light protection, a cheap Collapsible Rubber Lens Hood can work fine.
You may also have to find a different lens cap, and using filters is a pain. Other than than, it's a more suitable situation than a bare lens.
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You may also have to find a different lens cap, and using filters is a pain. Other than than, it's a more suitable situation than a bare lens.
http://www.bhphotovideo.com/bnh/controller/home?O=&sku=70736&Q=&is=REG&A=details
http://www.bhphotovideo.com/bnh/controller/home?O=&sku=23169&Q=&is=REG&A=details
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