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Summitar with hexagonal iris


dan d. chang

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I have the Summitar with the higher number of blades - 12? I took some pictures that had lovely bokeh but recently I had a couple with terrible , ring-like out of focus areas. The out of focus rendition seems to depend a lot on the exact focus distance and the aperture.
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From various readings over the years I've come to understand that bokeh is a function of quite a number of parameters, not just the number or shape of the aperture blades and aperture opening. It's related to the circle of confusion (coc) limits, the distance(s) in and out of the actual focal plane, the aberrations corrected and left in, etc. Please correct me if I'm wrong, and add to this list too.
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