There are some older lenses which have more aperture blades than most
modern ones, good for bokeh. Jupiter 9 85mm f2 (~1960s Russian copy of
a ~1930s Zeiss design) has 15 & this m42 Pentax is the only lens I've
ever heard of with 18.
https://www.pentaxforums.com/lensreviews/Takumar-200mm-F3.5.html
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