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Does LOW in the ISO settings equate to a particular value? The manual is opaque on this, as on so much else. Is it 'low', as in 'below 200' (and if so, what?), or 'low' as in 'the low end of 200-25600'? Why not just give the thing an actual value?
It's effectively ISO 100. You can get exactly the same result by leaving the camera at ISO 200, over-exposing by 1-stop and then pulling it back in PP (assuming you're using RAW of course!).
Because the chip has an "optimal" speed of 200 ISO, the lower setting is really a bit of a fudge. It gives slightly lower dynamic range. However, it saves having to, as Paul says, fiddle around in PP and enables a wider f stop to be used. In the real world I find it useful and don't really notice much of a DR fall-off.
Stephen
A camera takes a picture. A photographer makes a picture
Hi I have tested this theory. And could not produce an I so 100 to blow a highlight or lose shadow detail, of the same shot at I so 200, where if there was a loss of Dr it should have. But I so 100 gives an advantage when using my 75 f1.8 lens wide open in bright light conditions. Especially when in use with the em5 don't think that it would be a problem for the em1 as it has 1/8000th second shutter speed as a posed to 1/4000th.
I did some controlled testing of ISO low on my E-M5 and used rawdigger to examine the output. There is definitely more clipping on highlights (raw values at max) using ISO low at the same EV exposure setting. Whether you'd notice this in anything other than extreme situations in the real world is another matter. Personally, I'm happy to use it if it means keeping the aperture wide for DOF control. However, whilst it does deliver lower noise, I don't think the difference for this reason makes the reduced DR worth it.
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