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SMC Pentax M 50mm f1.4 & SMC Takumar 50mm f1.4 Differenc
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PostPosted: Tue Jul 05, 2022 7:48 am    Post subject: Reply with quote
Somewhere in the SMC K-series thorium was replaced by lanthanum. Since the SMC Takumar's (with rubber focussing ring) were contemporary, this may be true for those too.
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