So... I finally come to a decision to go with the OM-D... Is there any big hand users out there?

Started Mar 13, 2013 | Questions thread
Martin.au
Senior MemberPosts: 5,408
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Re: Issue 2: How to fairly compare output image IQ of two similar DSCs
In reply to Jack Hogan, Mar 17, 2013

Jack Hogan wrote:

Mjankor wrote:

Quote from Jack Hogan:

"Camera manufacturers can define ISO (S) as they please thanks to a lax standard. Because of this fact it is not possible to measure the performance of camera A at a set in-camera ISO (let's call itSubjective S) and expect to meaningfully compare its results to those from Camera B at the same ISO setting."

Sure looks like you claiming that there is "Inconsistent in-camera ISO labelling by manufacturers."

Indeed. Does the rain fall down or up? Just look the next time you are out

Now give an example of one, because from what I've seen all cameras stick pretty close to the ISO 12232:2006 standard.

Now, you may claim that how that ISO relates to DXO's ISO is arbitrary, as it is, but that's not a problem. Instead, as DXO have said:

"In fact, it is precisely the JPEG ISO value that all the manufacturers publish. They do so because JPEG (or any RGB) output is the visible output that photographers use. So when you select ISO 800 on your camera, you’ll have a JPEG ISO at 800, but the RAW ISO will be at (for instance) 550. The JPEG results are achieved by playing with the tone curve shape. This is absolutely legitimate: the ISO standard allows manufacturers to use this JPEG value. They are not cheating."

This manufacturers ISO is definitely not arbitrary, and cameras stick pretty closely to it.

PS

Yes, your quote was verbatim. Here's the original

http://forums.dpreview.com/forums/post/51045742

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