Posts Tagged ‘antialiasingfilter’
We’ve said it before and we’ll say it again, October is looking to be a big month for camera announcements. And of course, along with announcements come leaks. Case in point: the upcoming Pentax K-3 isn’t supposed to be announced for another 24 hours or so, but someone at Ricoh accidentally let the webpage go live briefly. Read more…
When Nikon released its D800E and D7100, people were surprised to learn that these models did without the Optical Low Pass Filter (aka. the Anti-Aliasing Filter). The resulting images from these cameras were sharper, but more easily fell pray to moire patterns in certain situations — in other words, it was a tradeoff.
But Nikon would like you to have your cake and eat it too, at least according to a recent patent the company filed with the Japanese Patent Office. Read more…
Sony now has two full frame compact cameras in its lineup—kinda. The company today announced the RX1R, a souped up (or perhaps stripped down?) version of the RX1 that shoots sharper photographs by ditching the anti-aliasing filter in front of the sensor. Aside from the lack of an AA filter, the RX1R and its sibling are virtually identical cameras.
Last week, we pointed you to a piece by the New York Times on how Fujifilm is attempting to kill moiré without killing sharpness by designing its sensors in a way that eschews the traditional anti-aliasing filters used in digital cameras. Photographer Martin Doppelbauer disagrees with Fuji’s claims: he has published a piece arguing that, “digital cameras without aliasing filters are cameras with a built-in design flaw“:
To omit an alias filter in front of a digital image sensors is like building a sports car with no brakes. Of course, the car accelerates a little faster due to the lower weight and the cornering ability is also better due to the smaller unsprung weight – but ultimately it lacks an essential functional element.
For analog cameras, an alias filter is not required: Film has no sharply defined limit of resolution. It loses contrast and resolution gradually with increasingly higher frequencies. You could say, the low-pass filter is already incorporated in the film itself.
[...] By omitting the alias filter, the recorded image information [...] does not increase! Even though images of cameras without aliasing filters may appear sharper and crisper: Images of cameras with a proper alias filter can easily be re-sharpened to achieve the same visual impression – without side effects.
So according to Doppelbauer, the recent fascination with removing anti-aliasing filters is more based in marketing rather than science.
Alias-filters: Yes or No? [Martin Doppelbauer]