Desactivatable AA filter on next high end Nikon?

[BernardLanguillier]

This could be further closing the gap with MF while providing flexibility for those photographers covering several domains.

http://nikonrumors.com/2011/05/21/nikon-patent-for-onoff-optical-low-pass-filter-olpf.aspx#comments

Cheers,
Bernard

[Josh-H]

This could be further closing the gap with MF while providing flexibility for those photographers covering several domains.

http://nikonrumors.com/2011/05/21/nikon-patent-for-onoff-optical-low-pass-filter-olpf.aspx#comments

Cheers,
Bernard

Wow... thats a great idea. I hope they implement it.

[HarperPhotos]

Hello,

When I read this I nearly got an erection. Please Nikon put this in the Nikon D4x.

Cheers

Simon

[Rob C]

Hello,

When I read this I nearly got an erection. Please Nikon put this in the Nikon D4x.

Cheers

Simon

You poor devil - are you on beta-blockers too?

;-)

Rob C

[feppe]

Aren't MFDBs at ~30 MP range * quite prone to moire? And at what point does removing AA filter result in aliasing artifacts and jaggies instead of "real" resolution?

* assuming that's where next gen FF sensors will be

[Bart_van_der_Wolf]

Aren't MFDBs at ~30 MP range * quite prone to moire? And at what point does removing AA filter result in aliasing artifacts and jaggies instead of "real" resolution?

* assuming that's where next gen FF sensors will be

Removing the AA-filter (Optical Low Pass Filter, OLPF) will always increase the susceptibility for Aliasing. However, it will not always result in easily visible artifacts (or fake detail that's clearly noticeable). It requires an interaction with good optics, good focus, an aperture that's not too narrow, and subject detail that's imaged small enough (smaller than 2 sensels, 4 sensels in a Bayer CFA) and has enough contrast to cause visible trouble.

Unfortunately there are enough scenarios where Aliasing artifacts will require a postprocessing attempt to tame them. Therefore it would be a good thing is one has a choice to either use an OLPF or not. It will add to the complexity of a camera, and these OLPFs are not cheap to begin with.

Cheers,
Bart

[hjulenissen]

I think that everyone interpret this patent as being AA on/off. Without really reading the patent: what if it is really about dialing in two different AA filters, one for still images (like today) and another lower frequency one suited for video? That would solve the line-skipping aliasing that is holding VDSLR back from competing with expensive dedicated solutions.

"changes the low pass filter characteristic of a low pass filter component between the 1st characteristic and the 2nd characteristic."

-h

[Christoph C. Feldhaim]

In the fwd position the filter should spread more for geometrical reasons and thus should filter out more frequencies  than in the aft position. But I don't see it removed (off). Maybe the effect on the image (depending on the diffusing power of the filter) is so low in the aft position near the sensor, that it appears like an "off" in the end.

[JohnTodd]

I had a crazy notion for a DSLR where the AA, IR and Bayer filters were all separately hinged, so that one could flip down to the bottom of the mirror box, one to the left and the last to the right, so you could choose any combination of them to be in front of the sensor. Might have a few dust issues :-)

[hjulenissen]

I had a crazy notion for a DSLR where the AA, IR and Bayer filters were all separately hinged, so that one could flip down to the bottom of the mirror box, one to the left and the last to the right, so you could choose any combination of them to be in front of the sensor. Might have a few dust issues :-)

AA and IR perhaps. Bayer filter would be difficult to algin I guess.

-h