That's the thing. The bokeh of mirror lenses will
always be ghastly no matter what. I think mirror
lenses have to be fixed apeture due to the way the
light moves through the lens (although there are some
that do have a variable apeture, they are usually
ultra rare and come in some wierd mount like Exactica
or Arriflex) This is why no pro ever uses mirror
lenses.
F8 really darkens a standard 1-13 screen too so use an
all matte or clear field prism like the 1-6.
Mark Lloyd
--- "Daniel J. Mitchell"
<DanielMitchell@xxxxxxxxxxxxx> wrote:
> > Cons are that it almost always has a fixed apeture
> > (usually at f8 or so).
>
> Why is this the case? I've only ever seen mirror
> lenses at f8, but what is
> it about the design that stops them putting aperture
> blades in there?
>
> Also, how awkward _is_ this? f8's a reasonable
> aperture, I guess, but do
> you end up needing a lot of ND filters or something
> in practise?
>
> (There's normally a few on e*ay for $130 or so;
> various brands, but they
> all look pretty much identical. I'm almost tempted,
> but the bokeh I've seen
> on mirror shots is so ghastly I'm afraid..)
>
> -- dan
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