You really can't make that jump. There are lots of things that prevent
it. Just one example is digital noise. One of the criticisms of the
Kodak SLR/N and SLR/C is the noise. The reason for the noise is that
they have chosen a wide dynamic range curve for the camera and you find
noise lurking in all the shadows. Most other makers use a curve that
covers the noise with shadow reducing the dynamic range. Noise
reduction can lower the noise floor a bit and extend the dynamic range.
Thom Hogan did a careful comparison of various DSLRs that took Nikon
lenses in his subscription journal and found they ranged from about 7
stops to 8 1/2 stops with the widest being the Kodak.
Interestingly the new Photoshop CS2 makes the merging of varying
exposures of the same scene much easier, almost automatic with a tool
called HDR Merge. Reichmann discusses it on his site. Ideally you
bracket exposure with a number of shots and open them in HDR Merge and
then it does the job quickly without help from you. Looks very cool.
Winsor
Long Beach, California, USA
On May 10, 2005, at 5:39 AM, Chuck Norcutt wrote:
> 12 bit raw files.
>
> Chuck Norcutt
>
> Winsor Crosby wrote:
>
>> Not sure about that. I have seen some test results from pretty good
>> cameras that show 7 1/2 to 8 stops. What is the basis of 12 stops?
>>
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