Jim Brokaw wrote:
>
> John Hermanson wrote:
> >
> >> Half circle (split image) goes dark on all focus screens of that type
unless
> >> it's made by Canon. They found a way to make split image screens that
don't
> >> black out below f4.5 (or whatever the f is).
> >>
>
> Olympus did this too... with microprisms on the 1-6 and 1-7 screens (I
> think). It is related to the angle of the wedge or prism sides, a screen
> that is usable for slower long teles won't be discriminating enough for
fast
> short-focal length lenses, so you need to match them up. Then you need a
> body for each screen and lens, so you don't have to switch screens all the
> time when changing lenses.
> --
Well Jim, sounds like an excellent excuse to buy more bodies, that's at
least 4. Wide & tele in both print & slide film, possibly black & white
too, so thats 6......... ;)
Andy Gilbert
Exeter
Devon
England
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