ISO 100, OMD-EM1II and firmware 3.0?

Started 2 months ago | Questions thread
OP Architeuthis Regular Member • Posts: 158
Re: ISO 100, OMD-EM1II and firmware 3.0?

JaKing wrote:

Wolfgang, I only ever felt the need to use the extended LOW ISO with my E-30, not with either of my E-M1s (MkI or MkII).

With the E-30, which was a real noise machine given half a chance, using ISO 100 certainly lessened the noise. Never noticed any other changes for good or ill.

The main advantage is that you are getting a longer exposure on your sensor because the (nominal) ISO is lower. If you catch twice as many photons this way, the noise will be lower.

I suspect that using extended LOW settings with any camera that offers it/them is going to help with noise, but little else.

With the E-M1 MkII, using the lower extended settings keeps DR much the same, and that's a considerable improvement on previous sensors, most of which caused the DR to drop when using the extended setting (e.g. my E-M1 MkI). See Bill Claff's site for comparisons of whatever cameras you choose. It is here:,Olympus%20OM-D%20E-M1%20Mark%20II

This is very interesting, JaKing.

One must say, however, that the nominal ISOs that the camera manufacturers provide seem to be lies: DxO states that on the EM1II both nominal ISO64 as well as ISO200 correspond to real live ISO of 83. For EM1 nominal ISO100 and ISO200, the real live ISO is 122 in both cases:

When EM1 and EM1II real ISO vs. DR is compared, the performance of both cameras is pretty the same...

So what is the difference between extended ISO (I assume also the "new" ISO100 is extended ISO) and base ISO (both mean ISO83 (EM1II) or ISO122 (EM1), respectively)? Does the "new" ISO100 mean just another ISO83 setting?


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