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I have owned both the 55/1.8 SMC Takumar and the 55/2 super-takumar. I sold the 1.8 with one of my Pentaxes and kept the 55/2 which, in my case, was definitely superior -- I'm now using it on a Canon 10D.
Lorriman, I'm not sure what you mean when you ask about the aperture being round. Mine has a 6-bladed aperture, so I would say it's not round. Nevertheless, it has beautiful bokeh which is more a function of the gauss-symmetric design than aperture shape.
I have an old (authoritative) report that says the 55/1.8 and the 55/2 were the very same lens. Those that did not meet the transmission specs for 1.8 were produced as f2 lenses. Indeed, mine has an addition click stop beyond f2, but there is no marking on the aperture ring. I don't know what changes occurred with the super-multicoated generation, but I was never satisfied with my 55/1.8 smc.
Des
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