Is the optical formula of Takumar 500/4,5 the same as SMC PENTAX 1:4.5/500? http://digilander.libero.it/aohc/tak05e.htm says 4 elements in 4 groups for Tak and so does http://www.bdimitrov.de/kmp/lenses/primes/extreme- tele/K500f4.5.html for K 500. But is the optical design the same? If not, where I can find the optical diagram for Takumar lens?
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