You lose about 1/3 stop of light, image degradation, difficulty keeping the mirror clean... pellicle mirrors were used in some cine cameras, though.
All the best!
Raimo K
Personal photography homepage at:
http://www.uusikaupunki.fi/~raikorho



----- Original Message ----- From: "Mark Erickson" <[EMAIL PROTECTED]>
To: "Pentax-Discuss" <pentax-discuss@pdml.net>
Sent: Saturday, January 08, 2005 1:22 AM
Subject: Why didn't Pentax....



...use a pellicle-mirror design in their recent DSLR's? A Pellicle mirror
design, which splits the light between the viewfinder and the CCD array
rather than using a flip-up mirror, would yield the following features: the
camera ISO would start at 100 rather than 200; the viewfinder would never
darken; the camera should be quieter, more reliable, and consume less power
due to fewer moving parts; and the CCD would be protected from dust by the
pellicle mirror.


There must be a downside or two; otherwise such cameras would exist.
Thoughts?

--Mark




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