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

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xpatUSA
xpatUSA Forum Pro • Posts: 17,936
Finally - a Possible use for "High" ISO *** with the Foveon!
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*** To me, anything over 100 ISO is high.

I use my SD15 sans the UV/IR dust-cover. This affects the metering because the AE sensor below the mirror is almost blind to IR. Therefore when I meter a scene, the metering recommends an exposure as if the sensor is only getting visible light, whereas we should know that it's often getting a ton of IR into the bargain.

Ergo, it is necessary to apply negative EC to the settings so as not to over-expose the sensor. The amount of negative EC needed is dependent upon the amount of IR coming from the scene and upon occasion I have run out of adjustment at -3EV.

My un-tested thought is:

What if I were to set the ISO at say 400? This under-exposes the sensor by 2EV for visible light, but is reasonable enough when IR is included. Then I could go from -5 to +1 EV adjustment in terms of effective EC.

Any comments, especially from full-spectrum shooters?

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