Canon 5D mk III native ISO vs Expanded

[Loswr]

Hi all,

I read somewhere that its best to stick to ISOs such as 100, 200, 400, 800, 1600, 3200...
and the not the ones in between as 125, 160...?

Is there any truth to this?

Thanks,

Some truth. Rather, I'd say avoid the +1/3 'tweener' settings of ISO 125, 250, 500, 1000, etc., on bodies except the 1D X.

 

[Marsu42]

I read somewhere that its best to stick to ISOs such as 100, 200, 400, 800, 1600, 3200...
and the not the ones in between as 125, 160...?

Some lower 160x-multiples have a very small dynamic range advantage, but nothing to write home about - but it was the research starting point for Magic Lantern's mini_iso module to provide a real +1/3 to +1/2 dr improvement on full stop isos. See the same link I provided above for information on this.