"whisky-dave" wrote in message
...
so you don't need a mirror lens for bokeh, I knew this in the mid 70s
Bokeh isn't new.

I never suggested that you did. I simply said that the bokeh of a mirror
lens was characteristic - a doughnut shape on any bright highlight which is
very out of focus, rather than a solid disc or solid polygon in the shape of
the lens aperture that you'd get with a purely refractive lens.