It finally "clicked" in my diseased old brain. I've often pondered the elusive "creaminess" of the out-of-focus areas of some lenses. What appeals strongly to me are sharp highly corrected high-contrast lenses with lots of aperture blades. None of my modern lenses have such an aperture. They all have the typical out-of-round apertures. I DO realize there are other qualities that differentiate modern lenses from classic but... it's ONLY the round apertures that interest me. Are there modern shutters into which I can transfer my #0, #1, and #3 sized cells? I realize I'll need new scales. That's okay. BTW, I don't need flash sync.