How do you decide this case base on your experiences

[duydaniel]

a) ISO 6400 and the metering shows -1
b) ISO 12500 and the metering shows 0
c) ISO 25600 and the metering show +1

You can only choose one.

Which one should give you the least noise or best quality given you can do PP?

 

[dave]

Maybe you should just give it a go.

Also depends on the camera.

 

[duydaniel]

Maybe you should just give it a go.

Also depends on the camera.

If dark areas on the frame is more than 50%, I will choose under expose (a), and over expose if less than 50% (c), or (b) if 50/50 darkness and brightness. However it is very subjective. I want to get better at this so I ask 8) people may have different ideas about this though

 

[Loswr]

I'd choose the lowest one I could to give me the shutter speed and/or DoF I needed, since I'll take noise over motion blur or too thin a DoF.

Note that I'm talking about the 1D X, where all of those are native ISO settings. Rather than use an expanded (H1, etc.) setting, just underexpose to meet shutter speed/aperture requirements, then push in post - that's what your camera is doing anyway.

 

[Mt Spokane Photography]

a) ISO 6400 and the metering shows -1
b) ISO 12500 and the metering shows 0
c) ISO 25600 and the metering show +1

You can only choose one.

Which one should give you the least noise or best quality given you can do PP?

I'd need more information as to what your talking about. Is the camera in manual? Normally, I'd use 6400 and open the lens one stop or slow the shutter one stop.

There is insufficient information to know what the situation actually is.