I'm aware there's some controversy regarding what makes good bokeh... or if such a thing even exists. I don't intend to start a riff. I'm convinced (I know) that lens design and aperture roundness both affect OOF image quality both in front of and behind plane of focus. So, please let's not get into a heated debate over "bokeh". I saw some animus a couple years ago when I asked about bokeh. I posted back then that, IMO, a nice round aperture was as important as lens design regarding pleasant bokeh and a few disagreed. That's okay but, again, let's keep this focused on the image rendering benefits of rounder apertures. So... how round is round enough? I just bought a 250mm Imagon in an older Copal #3 shutter that has ten blades (it's not here yet). I'm thinking it's aperture is "round enough" such that it would be very difficult to discern the difference between using the shutter's built-in adjustable aperture vs. using a perfectly round disc insert (outer holes blocked because I don't like the effect). The ten-blade Copal #3 aperture is not as nearly perfectly round as many older apertures with 12-20 blades but it's not bad. So, what do you think? Is the ten-blade aperture in the older Copal #3 "round enough" that I can use it rather than the slip-on discs (peripheral holes closed) such that I can't tell the difference?