Ideal resolution for a full frame Foveon sensor?

Started Mar 4, 2012 | Discussions thread
Usee Senior Member • Posts: 2,223
Re: Ideal resolution for a full frame Foveon sensor?

DaSigmaGuy wrote:

I just did a calculation to work out what the resolution of a full frame Foveon sensor would have, if it has the same number of photosites/mm as the SD1 sensor has...It works out to be about 34.6mp x3...Or as Sigma would say, 103.8mp!

The same calculation but with the same photosites/mm as the SD15 returns a much more modest figure of 14mp x3...Or as Sigma would say, 42mp...Less than the resolution of the SD1 with a 1.5x crop sensor!

Clearly the photosite size of a full frame Foveon sensor could be made much larger and hence less noisier, with a much higher dynamic range and much better high ISO capability, whilst still allowing a sizeable increase in resolution over the SD1.

Personally, I'd be more than happy with a 20mp x3 full frame Foveon sensor because of the fantastic image quality it would give compared to the SD1.
For IQ and filesize sake, I think Sigma should not go above 25mp x3.

So what resolution would like to see Sigma use for a future full frame Foveon sensor?

Beside the pixel size, one should also take in account that the layered sensor has a certain depth...

...thus one needs a suited light path (not only in the center, but also in the corners of the frame) to maintain pixel seperation and to avoid smearing and vignetting.

Therefore I think, that FF would only make sense (without further compromising the Foveon look) if the mount is big enough to allow telecentric lens designs,
like they probably use in the Merrill DPs...

...for the actual SA-mount one shouldn't go further than this:

... if uncompromised image quality really matters.

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