09-30-2010, 06:11 AM
[quote name='Brightcolours' timestamp='1285243739' post='3157']
The AA filter will only add to the softening already there, it will not "mask" it.
[/quote]
I don't think things add up like that. Which ever is causing the more blur will be the one that's causing all the blur. An AA-filter tries to create a blur around roughly every 3 photosites and so you can think of this as a blur the size of 3 photosites. If the blur from diffraction is less than the radius of 3 photosites, you won't see the diffraction. If the blur from diffraction is greater than the size of 3 photosizes, say 5 photosizes big, then you will only see a blur of 5 photosites big... not 5+3=8.
[quote name='Brightcolours' timestamp='1285243739' post='3157']
The diffraction softening that each pixel samples will be the same for both a Bayer CFA array sensor and a Foveon sensor. The Foveon pixels will never get more soft than the Bayer ones.
[/quote]
Umm again not sure if you should go there so easily. Diffraction limitation depends on the size of the photosites. But does that mean a 14MP Bayer sensor and a 14MP Foveon with equal sized photosites resolve the same detail (resolution)? The short answer is no.
All that aside, I've also heard people talk about diffraction occurring at the photosite-level on Foveon sensors because of the depth the light has to travel to reach the bottom most layer. So the bottom-most layer, red, will be getting less light than the rest and the top and (mainly) the middle layer will be contaminated with diffracted red light.
If anyone's wondering which side I'm on... I like Foveon for how it tries to work and for most of its results. But Bayer CFA tends to give the most usable output <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />
GTW
The AA filter will only add to the softening already there, it will not "mask" it.
[/quote]
I don't think things add up like that. Which ever is causing the more blur will be the one that's causing all the blur. An AA-filter tries to create a blur around roughly every 3 photosites and so you can think of this as a blur the size of 3 photosites. If the blur from diffraction is less than the radius of 3 photosites, you won't see the diffraction. If the blur from diffraction is greater than the size of 3 photosizes, say 5 photosizes big, then you will only see a blur of 5 photosites big... not 5+3=8.
[quote name='Brightcolours' timestamp='1285243739' post='3157']
The diffraction softening that each pixel samples will be the same for both a Bayer CFA array sensor and a Foveon sensor. The Foveon pixels will never get more soft than the Bayer ones.
[/quote]
Umm again not sure if you should go there so easily. Diffraction limitation depends on the size of the photosites. But does that mean a 14MP Bayer sensor and a 14MP Foveon with equal sized photosites resolve the same detail (resolution)? The short answer is no.
All that aside, I've also heard people talk about diffraction occurring at the photosite-level on Foveon sensors because of the depth the light has to travel to reach the bottom most layer. So the bottom-most layer, red, will be getting less light than the rest and the top and (mainly) the middle layer will be contaminated with diffracted red light.
If anyone's wondering which side I'm on... I like Foveon for how it tries to work and for most of its results. But Bayer CFA tends to give the most usable output <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='
' />GTW