In praise of AA filters

Started 10 months ago | Discussions thread
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Re: Alias artifacts don't only occur in man-made objects
In reply to Great Bustard, 10 months ago

Great Bustard wrote:

Basalite wrote:

rovingtim wrote:

Once you take out the AA, the software of the camera necessarily much finish off partial signals. If it gets it 'right', it is rarely noticed. However, when it gets is wrong, we used to call that an artifact. Regardless, it is software invented 'detail'.

As someone point out to me, ever taken a shot of a stubbled man with a no AA camera and seen the occasional massive beard hair? Ever noticed how a camera with no AA will happily capture sharp detail of brickwork and then suddenly it go blank like someone blurred it in photoshop? Then a little further on, more sharp detail. No gentle transition.

Ever notice that some leaves on the trees look 'crunchy'? Ever notice that the colour shifts in busy areas of a landscape? For example, a clump of trees looks to be in a faintly purple shadow where none exists.

Ever notice that some 'photographers' are constantly striving to improve their ability to overlook the increasing alias artifacts of modern cameras?

That doesn't apply to Sigma cameras with their Foveon sensors.

Indeed. But they do have to contend with other issues which are, arguably, more serious:

Nonsense. Anyone who looks at that amazing sample image I posted from a Sigma DP3 and concludes that it has "more serious" issues than the typical blurry mush produced by Bayer sensor cameras is either in denial or delusional.

http://www.dpreview.com/forums/post/52373209

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