DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
Martin.au
Martin.au Forum Pro • Posts: 13,293
Re: DxOMark's measured ISOs vs. manufacturer ISOs
1

Jack Hogan wrote:

Mjankor wrote:

Ok, so in my case that would be comparing:

OM-D at f5, ISO 800, 1/800 and

E520 at f5 ISO 400, 1/800.

Assuming all else is equal (I have no idea), close enough.

So you want to overexpose by 1 stop on one camera by running a higher camera ISO, then drag that exposure back down to the same as the other camera in post processing?

Not necessarily, just make image brightness/contrast look more or less the same. You may need to do nothing depending on in-camera/in-computer processing.

Why would you want to do this comparison. Seems to have stuff all relevance to photography?

I don't know. Do you care that your E520 has more or less the same SNR performance at ISO 400 than the EM5 at about ISO 900? Or say you were in the market for a camera and you wanted to know which performed better on some specific parameters - really, not the marketing hype. Lots of other uses, especially if you are interested in IQ.

Please don't change stuff in quotes.

For approximately equal output image brightness the numbers would be

OM-D at f5, ISO 800, 1/800 and

E520 at f5 ISO 400, 1/400.

Personally I'd have thought the best way to check IQ of a camera against other cameras if you were concerned about ISO would be to shoot the same scene with both cameras with the same shutter speed, ISO and aperture and have a look at the resulting photos. Maybe I'm a bit old school that way.

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