Pellicle (pellicule)
A thin film used in one shot colour cameras as a semi reflecting surface.
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[edit] Pellicle mirror SLR
Advantages
More resistant mirror
Bright viewfinder
More compact body ...
What is a pellicle mirror?
As noted above, most SLRs contain moving reflex mirrors which flip up to let light from the lens expose the surface of the film or the digital image sensor. However some SLRs use fixed mirrors instead.
The future: a pellicle-mirror electronic viewfinder camera in a Minolta MAXXUM body!
Sony 18-250mm.
NEW: Sony 18-250mm Review.
By implementing a pellicle mirror, the Sony A77 can use the superior phase-detection method of focus during high-speed shooting, live view and video, unlike most other DSLRs which must switch to the slower contract-detection, ...
Fixed, pellicle-type semi-translucent mirror
Maximum ISO 12,800 (with a quasi-ISO 25,600 'Multi-frame NR' option)
15-point phase-detection AF array with 3 cross-type AF points
Electronic viewfinder with 1.15 million dot resolution
Built-in GPS ...
Note that a few 35mm SLRs have been built with fixed semi-transparent mirrors called "pellicle mirrors". The Canon EOS line includes a cheap discontinued EOS RT model and an expensive current EOS-1 RS model.
A few cameras, such as the Canon Pellix, have avoided this problem by using a semi-silvered mirror - called a pellicle - which can stay in the light path during exposure. This also removes the mirror slap problem.
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The downside of these "fixed mirror" (pellicle) designs is that they cost about 2/3 stop of light at the film, and 1 1/3 stops in the viewfinder. The upside is that you can see through the viewfinder in real time.
 See also: Photograph, Film, Image, Camera, Time
  
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