In praise of AA filters

Started Oct 23, 2013 | Discussions thread
Great Bustard
Forum ProPosts: 24,681
Like?
Speaking of delusional...
In reply to Basalite, Oct 25, 2013

Basalite wrote:

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:

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

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.

...who posts a photo of a scene from Camera A and no corresponding photo of the scene from Camera B, and concludes that the sensor in Camera A is superior?

That said, Foveon sensors, as a general rule, resolve as well as Bayer sensors with double the pixel count. So, we'd compare the DP3 to 30 MP Bayer, in terms of resolution, which only a few current cameras are sporting.

Also, the lens does play a role, as you may have guessed, and the DP3 has an excellent lens, which makes it an excellent camera for base ISO photography if you like that single focal length that you are locked into ('tis a pity that Sigma does not make those cameras with interchangeable lenses). But to deny that Foveon has issues, well, speaking of delusional...

In short, it's pretty clear that you're a Foveon fanboy, based on your posts in this thread, the likes of which are even known to Dr. Fossum:

http://www.dpreview.com/forums/post/52378381

So, aside from "entertainment value", I don't think there's much more to be gained here.

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