Different DSLR sensitivities

http://forums.dpreview.com/forums/re...ssage=13523054

This is old news, we have seen this before and guess what, it means
absolutely nothing.

"RichA" wrote in message
...
http://forums.dpreview.com/forums/re...ssage=13523054

RichA wrote:

http://forums.dpreview.com/forums/re...ssage=13523054

I posted that data (first chart) here back in Feb or Mar.

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Pete D wrote:

This is old news, we have seen this before and guess what, it means
absolutely nothing.

Unless you're incident flash metering in the studio ...

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-- r.p.e.35mm user resource: http://www.aliasimages.com/rpe35mmur.htm
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RichA wrote:

http://forums.dpreview.com/forums/re...ssage=13523054

Yeah, we had a thread about that here like a billion years ago. As I
recall, from the description of the article, which I don't have and
wouldn't be able to read anyway, they were measuring something, but
ISO sensitivity wasn't it.

--
Jeremy |

"Alan Browne" wrote in message
...
Pete D wrote:

This is old news, we have seen this before and guess what, it means
absolutely nothing.

Unless you're incident flash metering in the studio ...

After your first test you will adjust anyway.

"Jeremy Nixon" wrote in message
...
RichA wrote:

http://forums.dpreview.com/forums/re...ssage=13523054

Yeah, we had a thread about that here like a billion years ago. As I
recall, from the description of the article, which I don't have and
wouldn't be able to read anyway, they were measuring something, but
ISO sensitivity wasn't it.

It's interesting idea. I thought the point was to show which cameras has the
most noise. Did it fail to do so?

In message ,
"Pete D" wrote:

This is old news, we have seen this before and guess what, it means
absolutely nothing.

The first slide is metering. The second is noise, but it is not
measured at the RAW level with external exposure, so it, too, is subject
to metering and noise-reduction in conversion and PP.
--


John P Sheehy

In message ,
"Dave R knows who" wrote:

"Jeremy Nixon" wrote in message
...
RichA wrote:

http://forums.dpreview.com/forums/re...ssage=13523054

Yeah, we had a thread about that here like a billion years ago. As I
recall, from the description of the article, which I don't have and
wouldn't be able to read anyway, they were measuring something, but
ISO sensitivity wasn't it.

It's interesting idea. I thought the point was to show which cameras has the
most noise. Did it fail to do so?

I think so. Noise should be tested with detailed targets, with external
metering; not the camera's. Should be done with raw RAW data, too, IMO,
as conversion has so many variables.

JPEGs are not "the camera", unless the camera only does JPEGs.

There really isn't a monolithic noise figure, anyway. The issues are
too complex to be handled the way they usually are.
--


John P Sheehy