On Tuesday, 6 October 2015 12:32:28 UTC+1, NY wrote:
"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.

If you knoew a little about photography you'd have know that bokeh isn't new,
and over 100 years old an nothing to do with mirror lenes, other than that mirror lenes made bokeh come back into the spotlight (sort of pun intented).

Which is why if you want to teach photography you do NOT start with a digital camera you can end with one of course.