Which 5D mk ii lens adapter do I need for this vintage lens?

Started 1 month ago | Questions thread
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5Dfan New Member • Posts: 7
Which 5D mk ii lens adapter do I need for this vintage lens?

I acquired several vintage lenses, all of which appear to have the same threading/diameter. The box for one of them says, "For Pentax, Yashica, Argus/Cosina and other same mount cameras".  Being new to photography, I'm not sure which lens adapter I need to make these fit on my Canon 5D mk ii. I see adapters for "Pentax K" and adapters for "Contax Yashica C/Y lens" but I'm unfamiliar with the history of these lens manufacturers and am not sure if they're describing the same thing as what this box implies. Any suggestions?

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