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Lack of anti-aliasing filters in some cameras?


7 years 8 months ago #491129 by Vincent
I know AA filters are supposed to fix moire and some other artifacts.  What I'm trying to figure out is why don't all cameras have this filter in them?  Didn't all cameras have this filter back in the day?  So what gives now?  Some having and some don't?  

What's the reasoning behind this select inclusion?  
Nikon D700 | 14-24mm f/2.8G ED | 24-70mm f/2.8G ED | 70-200mm f/2.8G ED VR II | (2) SB-900
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7 years 8 months ago - 7 years 8 months ago #491137 by effron
en.wikipedia.org/wiki/Anti-aliasing_filter

Looks like modern cameras have evolved....
Optical applicationsurl=https://en.wikipedia.org/w/index.php?title=Anti-aliasing_filter&action=edit§ion=1]edit[/urlIn the case of  optical  image sampling, as by  image sensors  in  digital cameras , the anti-aliasing filter is also known as an optical low-pass filter, blur filter, or AA filter. The mathematics of sampling in  two   spatial dimensions  is similar to the mathematics of  time-domain  sampling, but the filter implementation technologies are different. The typical implementation in  digital cameras  is two layers of  birefringent  material such as  lithium niobate , which spreads each optical point into a cluster of four points. [1]
The choice of spot separation for such a filter involves a tradeoff among sharpness, aliasing, and fill factor (the ratio of the active refracting area of a  microlens array  to the total contiguous area occupied by the array). In a  monochrome  or  three-CCD  or  Foveon X3 camera, the microlens array alone, if near 100% effective, can provide a significant anti-aliasing effect, [2]  while in color filter array (CFA, e.g.  Bayer filter ) cameras, an additional filter is generally needed to reduce aliasing to an acceptable level
Why so serious?
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7 years 8 months ago #491140 by Shadowfixer1
Images are sharper without the filter and the in camera software has come a long way in correcting for it, plus some sensor redesign which has helped.
www.betterphoto.com/?ramshots
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