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[OM] Re: Katz Eye E-1 focusing screen

Subject: [OM] Re: Katz Eye E-1 focusing screen
From: Pschings@xxxxxxx
Date: Wed, 17 Aug 2005 08:01:02 EDT
In a message dated 8/16/2005 11:39:33 PM Eastern Daylight Time, 
hiwayman@xxxxxxx writes:

>"Your screen will be made from the new 'Plus' material, which in case you 
haven't heard, >delays the well known prism blackout phenomenon until well 
after 
f11."
>
>This I gotta see!  It's due to ship in 2-3 days.

Prism blackout is a function of the geometry of the prisms, not the material. 
By using shallower angles in the prisms (split-prisms or microprisms), you 
can get the blackout point to be at smaller f stops. You lose precision, though.

I'm not an E-1 owner (yet), but I hope these screens work well. It seems like 
such an obvious accessory it's hard to understand why Olympus doesn't have 
one of their own.

Paul Schings

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