When the ISO setting is changed on the *ist-D, does that change the data recorded in the RAW file by actually changing the sensor sensitivity, or does it only affect how the recorded data is processed, post exposure.
Let's say I'm shooting at 1/250th and f 8 and I shoot one shot at ISO 200 and one at ISO 800, and everything - lighitng, subject, etc - is identical except the ISO setting. So, exactly the same about of light hits the sensor. Does this result in two identical files, which are then processed differently (due to the different ISO settings) to create effectively different exposures. Or, would changing the ISO result in a true change in sensitivity in the sensor, resulting in two RAW files with different data in them? In this case, even though the amount of light hitting the sensor is the same, the sensor itself would be more or less sensitive and record data differently.
I hope this makes sense -
MCC -----
Mark Cassino Photography
Kalamazoo, MI
http://www.markcassino.com
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