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Which 135mm one to keep? smc pentax-m 3.5, Takumar (Boyonet) 2.5 or smc Takumar 3.5 - PentaxForums.com
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S-M-C/Super-Takumar 135mm F3.5 Reviews - M42 Screwmount Telephoto Primes - Pentax Lens Reviews & Lens Database
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