Hulyss Bowman
Active member
ISO 1000 -
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ISO 1000 -
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It is definitively true with the new monochrome SPP addition the Foveon all of a sudden does way better vs trying color at high ISO. I take a small exception to this though (from the original OP):
"the Foveon sensor is suddenly up there with a color version of some of the better single layer sensors renowned for their prowess at higher ISOs (like Fuji's X-Trans, for example). "
I don't agree it does as well as the Fuji (at least at the highest isis), but it does pretty darn good. "The problem" with using the mixer and picking only blue is that you are effectively slanting the black and white images as if you shot with a blue filter.
Now, I said "the problem"- this isn't a problem if the image works. But one of the key features Sigma advertises for their BW vs say a pure monochrome camera like the Leica Monochrome is that you can simulate different color filters applied to a black and white camera. By using the blue channel mostly, you are basically canceling the benefit.
You are effectively shooting with a "blue filter always" on your camera. I noticed that their weight on blue does not seem to be "absolute" so human faces overall do not look downright horrible (as they would look with a blue only filter), so for many shots it does work (which is good).
Still speaking of the Fuji, the fuji does not have the issue of having to filter to blue like that. Of course on the fuji every single photo site is already color-filtered to a red, green or blue, but you certainly get more sensitivity to light on noise than having to use the blue layer. ISO 6400 on the Fuji (and up) still works better. In find 6400 works on the sigma if you re-size it down to like what used to be the previous foveon (4-4.7 megapixels) to a reasonable degree.
It's still good to have this option for sure. There's still lots of detail. In my testing I found that up to ISO 3200 it is quite reasonable (maybe cut at ISO 1600 but ISO 3200 being quite manageable).
- Ricardo