Sony A99 ISO6400 RAW files look spectacular....

Started Oct 5, 2012 | Discussions thread
Allan Olesen
Senior MemberPosts: 2,627
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Re: Sony A99 ISO6400 RAW files look spectacular....
In reply to JohnBee, Oct 5, 2012

johnbee wrote:

tbcass wrote:

Since you used +1.3 EV the true iso is only about 2800 or so.

Hi tbcass,
To my knowledge, ev adjustments has no impact on ISO values.

Noise is mainly caused by a lack of light, not by the actual ISO setting.

If you take a photo at ISO 3200 with no exposure compensation, and another photo at ISO 6400 with +1 EV exposure compensation, they will get the same amount of light and the same noise once they have been adjusted to the same light level in PP.

In my opinion it is ridiculous to compare noise at the same ISO setting on different cameras with different light metering and different ISO norm. What we should compare is noise at the same amount of light (same scene lightiing, same aperture and same shutter time).

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