Exposure is key (plus a55 noise boasting ^^)

Started Jan 5, 2013 | Discussions thread
Ralf B
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Re: Exposure is key (plus a55 noise boasting ^^)
In reply to AlexK-12, Jan 5, 2013

AlexK-12 wrote:

See, I'm still learning bit by bit about the science behind the image. What you are saying makes sense but I'm now just trying to figure out why. I've noticed that at ISO 100 and 1/4000 shutter speed can result in some noticeable noise (not much) which, if I am understanding you correctly, is because of the shutter speed?

As you say yourself, exposure is key. An underexposed shot at ISO 100 will show more noise than a correctly exposed shot at ISO 100, but most likely only in shadows or darker parts. A severely underexposed shot at ISO 100 will show even more noise, also in lighter parts. When correcting an underexposed shot in post, you apply digital gain in post which brings up noise.

Underexposure hurts at any given ISO. It just hursts a lot more when shooting at higher ISO, as the digital gain applied in camera has allowed to use less light for a start. Hence the signal-to-noise ratio is already compromised.

If the ISO 100 shot you mention was underexposed only you know - unless you share it with us here.

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Cheers,
Ralf
www.ralfralph.smugmug.com

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