http://www.imaging-resource.com/PRODS/olympus-e-m1/olympus-e-m1A.HTM
Via Image Sensors World
Quoted:-
"Low-pass filters, the lack thereof, and moiré
There's been a strong move in the camera industry lately to remove low-pass filters (aka anti-aliasing filters or LPFs) from cameras, in pursuit of greater image sharpness. The Olympus OM-D E-M1 is one of the latest camera models to join this trend.
At IR, we feel strongly that eliminating low-pass filters is a bad idea, and a mistake for the industry. While the vast majority of natural subjects aren't subject to aliasing and moiré issues, many man-made objects have the sort of regular patterns that trigger the problem.
The real problem is that once you've got moiré or color aliasing in your images, it can be very difficult, if not impossible, to remove."
"As noted above, these examples don't point a finger at Olympus alone: The same or worse can be found in the output from virtually any high-end camera built without an LPF."
They have their daily life example images to prove that they are right. Of course, as the most basic thing for digital sampling, the Nyquist theorem should NOT be violated!
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Tuesday, September 24, 2013
Removing AA Filters is a Mistake for the Industry, Said IR
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Comments by IntenseDebate
Removing AA Filters is a Mistake for the Industry, Said IR
2013-09-24T22:47:00+08:00
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SpendsalotonPentax · 598 weeks ago
Rataskanken · 598 weeks ago
Zobing · 598 weeks ago
I am member of a photo club where we use different cameras. I have played with Canon 7D/5D mkII (great colors), Sony NEX 5 (Very good colors), Sony NEX 5N and Pentax K5 (average colors) and the worst colors Pentax K5IIs and Nikon D800/E (shitty colors). Those who do not believe, instead of listening to fan boys and vendors, can check themselves on a calibrated screen the new test picture on dpreview (look at the red becoming orange, the dirty yellow ...).
Yoku · 598 weeks ago
mir52 35p · 598 weeks ago
foton · 598 weeks ago
rhermans · 598 weeks ago
So if you dont see any moire your lenses are so bad that they are doing the job of the filter. rofl
I guess that the filter is usefull but instead of making them better doing the research and making a complex expensive filter they now expect software to do the job, and you get more detail and they get extra money in the pocket.
Leschi · 598 weeks ago
Dan Johnson · 598 weeks ago
hys · 598 weeks ago