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RE: [OM] Long Focus vs. Mirror Lens

Subject: RE: [OM] Long Focus vs. Mirror Lens
From: "M. Lloyd" <royer007@xxxxxxxxx>
Date: Thu, 31 Jan 2002 12:44:10 -0800 (PST)
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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