Irrational views on SLT part duex

Started Jan 22, 2014 | Discussions thread
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Nordstjernen
Nordstjernen Veteran Member • Posts: 6,876
Re: Irrational views on SLT part duex

Shield3 wrote:

I thought you said "if both shots were exposed properly". Not "same amount of light hitting the sensor". Big difference.

Went back and read it. You said "If you first shoot a well exposed frame at ISO 6400 and then shoot at ISO 100 with exactly the same exposure settings, the processed pictures will look almost identical - same amount of shadow detail and same amount of noise!"

The PROCESSED pictures!!!

In my above shots the exact or very near the same amount of light was hitting the sensor. The exposure time was shorter in one than the other, but all other things were equal.

No, you did NOT. When using 1/8000 and 1/100 sec and the same aperture value, there is a HUGE difference on how much light that hits the sensor. Many, many stop difference!

As said, ISO setting has NOTHING to do with exposure (the amount of light falling on the sensor). The only two valid factors are shutter speed and aperture value. When changing any of these, or a combination of both, the exposure will be different.

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