Can Anyone Explain this?

leica M2 fan

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Joined
Jul 28, 2005
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I have been looking for a Zeiss Sonnar lens for my Kiev 4aM for a while. What is perplexing to me is that I've seen 50/1.5 Sonnar T chrome (40.5) and also 58/f1.5 Sonnar. Do they both fit? What is the advantage of one over the other? Any advice? TIA.
 
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