Unbiased noise test.

Started Feb 28, 2009 | Discussions thread
kevm14 Senior Member • Posts: 2,253
Re: Unbiased noise test.

Iliah Borg wrote:

1Ds MkIII and 5D MKII have very different colour filters. 5D MkII
filters are much more tuned towards the consumer benchmark - "pure"
noise at underexposure.

You can't really compare even noise from the shots you used - those
shots are underexposed to different degrees. Pretty much each camera
model has its ISO calibrated differently. The raw levels at middle
gray sometimes differ as much as 2+ times, that is more than 1 stop.
If you take this into account you should compare, say, D3X at ISO 400
to 5D MkII at slightly more than ISO 200.

I always felt like these tests would be most useful by locking the shutter speed and aperture and adjusting ISO until the exposure is right. Then modify shutter speed for the test. Really, what people need ISO for is to boost the shutter speed or allow the lens to close down a bit, or both. So the question should be what is the best each camera can do for a given shutter speed, aperture and EV?

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