Hi all,

I have seen many say that the number and shape of aperture blades doesn't significantly affect the quality of out-of-focus rendition (bokeh pattern). However, articles by Harold M. Merklinger and Christopher Perez suggest otherwise.

Perez' tests show improvements in out-of-focus rendition by remounting a Schneider Convertible 210mm f/5.6 from a 5-bladed #1 Copal shutter to a 10-bladed round-aperture Prontor. He suggests remounting lenses in shutters with more aperture blades. However, looking on eBay, I can't seem to find many shutters for sale; any suggestions?