Sorry, I made a slight mistake. The Oly 500 loses about .27 stop.
compared to a refractor. The .8 is falloff, middle to edges.
Tom
On Tuesday, June 11, 2002 at 19:34, ll.clark@xxxxxxxxxxx
<olympus@xxxxxxxxxxxxxxx>
wrote re "Re: [OM] long telephoto advice" saying:
> In <3D0629EC.20555.44D1685@localhost>, on 06/11/02 at 04:48 PM,
> "Tom Trottier" <Tom@xxxxxxxxxxxxx> said:
>
> >Yes, loses .8 stops. Oly has significantly more contrast than any
> >other mirror, but is not as sharp as the longer Questar or Celestron.
>
> Thanks. Most interesting.
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