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Finally - a Possible use for "High" ISO *** with the Foveon!

Started Oct 22, 2020 | Discussions thread
xpatUSA
OP xpatUSA Forum Pro • Posts: 23,016
Re: Finally - a Possible use for "High" ISO *** with the Foveon!

xpatUSA wrote:

I also feel another test coming on ... I have a radiometric meter (reads in W/m2, not lux) and a heat-lamp. It would be a simple matter to interpose my Marumi 700nm and see the difference.

Of course, the spectral radiance of a heat-lamp bears little resemblance to that of a green leaf in full sunlight - maybe I should measure that instead ...

Sun came out briefly today - so I rushed out with the meter and pointed it at a big green leaf, noted the reading, then interposed the Marumi:

Without Marumi: about 120 W/m2

With Marumi: about 90 W/m2.

Although the measurements were a bit wobbly (slight breeze, unsteady balance), the implication is that the "visible" part of the total leaf reflection is only approx 25% radiometrically speakin'.

That seems to confirm the need for a lot of negative EC with the SD15.

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