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

Started Feb 5, 2013 | Discussions thread
Jeff Charles Veteran Member • Posts: 7,514
Re: X-Pro 1: No exposure compensation in Auto-ISO - is this a bug?

mngsmt wrote:

Jeff Charles wrote:

jondh wrote:

Off course it is like that. Auto ISO is used with the purpose of getting better ISO based on the available exposure not to change the exposure of the manual mode.

Right. ISO cannot change exposure. Only aperture and shutter speed can do that.

Although maybe technically correct, I think this is nitpicking. The amount of amplification applied by the camera is definitely part of the equation for calculating the "exposure".

Understanding that ISO does not affect actual exposure is useful. You take a shot at 1/200, f/8, ISO 100 and see from the histogram that it needs 2 stops of brightening. In that situation, it may be tempting to just increase ISO to 400, but a better option would be to reduce shutter speed and/or increase aperture, circumstances permitting.

Think of a variable ND filter that sits in front of the sensor, for example. The fact that the signal amplification (aka ISO) sits kind of "behind the sensor" is not really important in practice.

There's a big difference. An ND filter reduces exposure (the light reaching the sensor). ISO has no effect on exposure.

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