X-Pro 1: No exposure compensation in Auto-ISO - is this a bug?

Started Feb 5, 2013 | Discussions thread
wchutt
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Re: X-Pro 1: No exposure compensation in Auto-ISO - is this a bug?
In reply to tee1000, Feb 6, 2013

It is not a bug or oversight. In manual exposure mode you manually adjust the aperture and/or the shutter speed to change exposure with your fingers. The using the EC dial is redundant and unnecessary.

You are confusing exposure with ISO. Only shutter speed and aperture determine exposure. In digital cameras ISO just changes the exposure index. Changing ISO lets you use higher or lower shutter speed and aperture combinations. But the only the shutter and aperture control  how much light reaches the sensor. ISO does not change how many photons are converted to voltage at each sensor site. ISO multiples the actual photon counts either  electronically or mathematically so in-camera jpeg rendering is convenient. ISO does not not make the sensor more, or less efficient.  It appears  to change the sensor efficiency  so the photographer  enjoys more flexibility.

This is explained here

http://www.luminous-landscape.com/essays/dxomark_sensor_for_benchmarking_cameras2.shtml

but you have to scroll down to the last third if this very long article.

Auto ISO is useful. If you want to keep the shutter speed fixed to freeze motion and also maintain a constant DOF, then Auto ISO is a convenience - you don't need to go into the menus to change the exposure index.

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