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2. Dust reduction system - Wikipedia

   en.wikipedia.org/wiki/Dust_reduction_system

   Olympus Corporation was awarded an innovation prize by the Japan Institute of Invention and Innovation (JIII) in 2010 for its invention of automatic dust reduction for digital cameras. [5] [6] Before that Sigma was sealing the mirror box of their cameras with a protective filter behind the lens mount, preventing dust from entering the camera body.

3. Pellicle mirror - Wikipedia

   en.wikipedia.org/wiki/Pellicle_mirror

   The pellicle mirror causes an up to 1/3-stop loss of light at the receptor, and a corresponding 2-stop loss of light in the viewfinder; The mirror has to be kept perfectly clean, or the light sensor and other electronics (as well as the image quality) will suffer. Owing to its thinness, the pellicle mirror is fragile, making it difficult to clean.

4. Optical coating - Wikipedia

   en.wikipedia.org/wiki/Optical_coating

   One type of optical coating is an anti-reflective coating, which reduces unwanted reflections from surfaces, and is commonly used on spectacle and camera lenses. Another type is the high-reflector coating, which can be used to produce mirrors that

5. 7 Cleaning Mistakes That Always Lead to Streaky Mirrors ... - AOL

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6. File:Cleaning a camera LCD before applying a screen protector ...

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7. Canon EOS 50D - Wikipedia

   en.wikipedia.org/wiki/Canon_EOS_50D

   The camera has Live View, which allows photographers to use the LCD screen as the viewfinder. Because the sensor mirror needs to be in the locked position (see Live preview), shutter noise is reduced in this mode. 15.1 megapixel APS-C CMOS sensor; 3.0 inch VGA LCD monitor; LiveView mode; Wide 9-point AF with center cross-type sensors

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9. Single-lens reflex camera - Wikipedia

   en.wikipedia.org/wiki/Single-lens_reflex_camera

   These pellicle mirrors reduce the amount of light travelling to the film plane or sensor and also can distort the light passing through them, resulting in a less-sharp image. To avoid the noise and vibration, many professional cameras offer a mirror lock-up feature, however, this feature totally disables the SLR's automatic focusing ability ...