AA Filter - Most digital SLR cameras employ a Low Pass Filter (LPF) or Anti-Aliasing (AA) filter in front of the imager to help eliminate color aliasing (moire) problems.
AA Filter - Most Digital SLR's have a "Low Pass Filter" (LPF) or AA (Anti-Aliasing) Filter in front of the CCD or CMOS sensor. This helps to eliminate colour aliasing problems, or the "moire" effect.
AA Filter
Anti-Aliasing Filter; used in front of camera's image to reduce moire effects.
AC Adaptor ...
AA filters ensure the images are natural in difficult situations, but they also rob sharpness when you look at 100%. They deliberately cut-off the highest spatial frequencies just below Nyquist.
With an 18 Megapixel full frame sensor, no AA filter, no need for IR filters, and the ability to take virtually every lens that Leica has ever made over the past 75 years, ...
AA filter of the sensor, A/D conversion, demosaicing, base sharpening and of course the lens resolution. However, the "front-"factors are all near-linear. Say, e.g. the AA filter has a factor 0.7 whereas the base sharpening has a factor of 1.5.
The reason for this is that although these cameras all have AA filters on their sensors, they are optimized for high-resolution still images, not ~2MP 1080p video capture.
Anti-Aliasing Filter (AA Filter)
This is an optical filter (also known as low-pass filter) placed on the sensor to create a slight blur or softening that helps counteract aliasing or moiré interference.
 See also: Filter, Software, Camera, Image, Light
  
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