Digital BW, The Print

Yes there is a difference.

As I understand it, with the Nikon method of adjusting the exposure the 
number of valid sample points (in its 14 bit space) doesn't change but 
their location in the histogram does.  For example if you make the 
first scan and it has 800 samples with data ranging from 200 to 1000.  
Adjusting the exposure may give you the same 800 samples but ranging 
from 300 to 1100.

By actually changing the gain you would, for example, get 1500 samples 
ranging from 200 to 1700.

On Wednesday, January 8, 2003, at 10:28 AM, Ernst Dinkla wrote:

>
> ----- Original Message -----
> From: "Austin Franklin" <darkroom@...>
> To: <DigitalBlackandWhiteThePrint@yahoogroups.com>
> Sent: Wednesday, January 08, 2003 3:33 PM
> Subject: RE: [Digital BW] Scanning and Zone Sys Development.
>
>
>> Ernst,
>>
>>> The Nikon 8000 has analog gain control. I presume that it works
>>> the same way
>>> as you describe it otherwise why call it "analog gain" control.
>>> It will show
>>> more noise in the shadows when set to a maximum
>>
>> Actually, I believe it's misnamed.  This has been discussed with Ed
> Hamrick
>> and should be in the archives.  It does not change the actual gain 
>> between
>> the CCD and the A/D, but the exposure time.  To quote from Ed Hamrick 
>> (who
>> wrote ViewScan) from the rec.photo.digital newsgroup:
>>
>> "The "Analog gain" in the Nikon is a bit misleading.  It's actually
>> just the exposure time for each of red, green, blue, and infrared."
>>
>> Austin
>
> In what way can one compare both methods ? Is there a difference in the
> results ?
>
> Ernst
>
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