I can verify to what Giles has to say below, I use a minolta 24~85 CR lens
the CR stands for circular, meaning the aperture blades form a circle rather
than
an angular shape and the out of focus backgrounds are just a dream.
Rgds Paul
Giles wrote:
> I believe the number of aperture blades is a contributing factor in the
> quality of
> bokeh a lens has. Out - of focus highlights often can be seen to have an
> angularity
> which corresponds to the shape of the aperture. I believe this also means
> that all
> out of focus areas, not just the highlights, are shaped by the aperture, it's
> just
> more obvious with highlights.
>
> So, the more aperture blades a lens has the more nearly circular it is and so
> the
> less angular shaped will be the out of focus areas. IMO anyway.
>
> Some f2 lenses have 6 blades, some have 8 and some have 9, like the 90mm f2
> macro.
>
> Giles
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