What is this fascination with iso6400?

Started Feb 11, 2013 | Discussions thread
John Sheehy Forum Pro • Posts: 19,137
Re: You don't shoot events
2

Adventsam wrote:

panos_m wrote:

Adventsam wrote:

iso6400 is not a panacea, its gain added at a large amount and you only have so much headroom.

You don't have to set iso 6400. You can "underexpose" lower iso in order to protect the highlight headroom and then apply the gain in post.

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Panagiotis

Exactly, I just said the same below, that's exactly what you would do, well most normal people will try and stick below iso1000 and pull it back in raw in post.

Only to maintain highlights; not to get less noise.  Most cameras have the same or less noise shooting at the desired exposure index as the ISO setting, compared to getting it by "under-exposing" the a lower ISO.

If someone shoots "ISO 1000", as far as the camera settings go, and uses -2.67 at exposure time and +2.67 in the converter, then they *are* shooting at ISO 6400; the camera just doesn't admit it, and you are not going to get the noise of ISO 1000 exposed "normally"; you will get the noise of ISO 6400, or even more noise, depending on the camera.  Above the ISO 1000 setting, however, there is very little difference in noise.  It is at lower ISOs where some cameras really do a horrible job shooting at true ISO 800 with the ISO 100 setting.

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