[nandadevieast]

[quote name='Sylvain' timestamp='1344546505' post='19739']

C'mon Sammy <img src='http://forum.photozone.de/public/style_emoticons/<#EMO_DIR#>/smile.gif' class='bbc_emoticon' alt='' />



nandavieast. There're possibly two reasons that we often read of :



-manufacturers have different interpretations of the standards and adjust their camera according to their own scale that may differ from others.



-manufacturers try to "cheat" so that ISO speed tests, when not carefully done and comparing cameras at same ISO values regardless of other settings, will look favorable.

E.g. camera A set at ISO1600 & f/8 uses a shutter speed of 1/250s

camera B set at ISO1600 & f/8 uses a shutter speed of 1/125s. Camera B may be showing identical noise levels but it does so by exposing twice as long.

Reviewers have found the OMD to be doing so by 1/2 to 2/3 of a stop, or something like that.



I guess that's what you read. IMHO, in the specific case of the OMD, I wouldn't bother much, the camera is a gem.



Greetings,

S.

[/quote]



Thanks, not bothered about that, i've been happily using the camera and i like it...was more to understand...

That means ISO 1600 on OM-D is actually ISO 1000-1200...seen from an exposure time and noise point of view?