10-01-2010, 05:03 PM
[quote name='boren' timestamp='1285952001' post='3434']
I'd be very interested to see real-life review that show that aliasing is indeed an issue with Foveon. I'm sure the effect can be demonstrated if one deliberately sets up the right conditions, subject, lighting and so on, but would it be visible in real life samples (as those in the end of the review at dpreview.com)?
Also, can you comment on the other points: "At what print size and viewing distance do you expect to be able to see it? What percentage of viewers do you feel would notice it?"
[/quote]
I am not against foveon sensors, Sigma cameras or AA-filterless cameras at all. I am merely explaining that the extra "sharpness" is an effect of the lack of AA-filter, not so much of it not being a non-bayer CFA sensor.
Because of the low resolution of the 3 and 4mp Sigmas, it would be apparent in relatively small print sizes, depending on the subject (straight lines in buildings/cars, silhouettes, hair etc.).
With the new 15mp camera, for the aliasing to show up you do need to go for bigger prints, obviously. Exactly the same as oversharpening...
But, the perceived extra sharpness will only show up with bigger prints too...
There just are people who like shooting without AA-filter. I am not one of them. And the foveon sensor has a bigger problem than aliasing: due to the nature of the sensor it will be more noisy at higher ISO settings.
I'd be very interested to see real-life review that show that aliasing is indeed an issue with Foveon. I'm sure the effect can be demonstrated if one deliberately sets up the right conditions, subject, lighting and so on, but would it be visible in real life samples (as those in the end of the review at dpreview.com)?
Also, can you comment on the other points: "At what print size and viewing distance do you expect to be able to see it? What percentage of viewers do you feel would notice it?"
[/quote]
I am not against foveon sensors, Sigma cameras or AA-filterless cameras at all. I am merely explaining that the extra "sharpness" is an effect of the lack of AA-filter, not so much of it not being a non-bayer CFA sensor.
Because of the low resolution of the 3 and 4mp Sigmas, it would be apparent in relatively small print sizes, depending on the subject (straight lines in buildings/cars, silhouettes, hair etc.).
With the new 15mp camera, for the aliasing to show up you do need to go for bigger prints, obviously. Exactly the same as oversharpening...
But, the perceived extra sharpness will only show up with bigger prints too...
There just are people who like shooting without AA-filter. I am not one of them. And the foveon sensor has a bigger problem than aliasing: due to the nature of the sensor it will be more noisy at higher ISO settings.