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@iheiramo:
you also could give a second chance to your M 100 2.8 - as a bokeh effect lens...
...for example mine...
...my bokeh unique - probably once disassembled and with reverse mounted rear lens...but i did keep it...
Pentax-M 1:2.8 100mm surreal or acid edition ;-)
F/3.4 - 4.0; K-1; linked to ooc jpgs.
shallow swirly background
some bubbles
central rest sharpness just sufficiently for an eye
cross post from Bokeh Club