Digital BW, The Print

whoops  Obviously I meant ND grads!

woody

--- Elwood Spedden <elwood@...> wrote:


---------------------------------
A further note. I think that, multiple exposures for
controlling dynamic range aside, it is perhaps more
imperative than ever with digital that ND filters be
used to control highlights. This allows opening the
foreground (more shadow) to stay as far away from the
noise floor as possible. I don't think the issue is so
much digital vs film as it is understanding the
characteristics of each so that proper exposures
within the limitations can be produced.

Reading reports from the pros quickly shows that they
believe more than ever in getting the exposure correct
"in camera." 

woody

--- Truman Prevatt <tprevatt@...> wrote:


---------------------------------
The difference between film and digital is (excause
the abuse of the 
term) how the grain shows up. In film the grain tends
to show up at 
higher light leves - zones 6 up. In digital the
"grain" which is really 
noise shows up at the lower levels - zones 3 down. The
difference comes 
from different physics producing the effects of grain.
In the digital it 
is the preamp noise that would be there - even
assuming the sensor was 
noise free. The signal levels are simply closer to the
noise floor and 
as such the values are impacted more my the noise than
the high level 
signals resulting from bright objects. In other words
in the shadows the 
signal to noise ratio is low while in the midleves up
it is high.

As long as you have a pre amp and ADC in the circuit
there is no way to 
eliminate this fully. As Paul noted placement of
values is extremely 
important because of this and I suspect for critical
work no mater how 
good they are the in camera meters are not sufficient
and a good old 
fashion spot meter would prove very helpful. When I am
doing critical 
work - be it with my 4x5 field camera or my digital -
I use my spot meter.

It is very interesting to think that Adams developed
the Zone System in 
order to get proper placement of values on film so as
to control the 
highlights (minimize blocking and grain). With a
digitial camera it is 
just as useful except in this case it is to minimimize
the impact of 
noise on the shadows.

Truman

Paul Roark wrote:

>>... are you saying that if you had been using film,
you could
>>have gotten the same or better results with a single
exposure? and
>>less manipulation?
>>    
>>
>
>I'm not sure about the single exposure.  I didn't
have my spot meter with me
>for the digital shot -- a mistake I won't make in the
future.  Given the
>"slide-like" 7 stop dynamic range, I'm going back to
carrying my Pentax spot
>meter.
>
>Medium format, Tech Pan film would probably have
ended up making a better
>image with less manipulation, however.  Also, I would
have been able to
>print larger than 16x20 with MF TP.
>
>MF Tmax 100 would probably not have made as good an
image, however.  The
>grain in the foggy parts of the image would have
shown.  With the Canon 8 mp
>image, the foggy areas are totally smooth, and I
really like that.
>
>Paul
>www.PaulRoark.com 
>
>_
>


-- 

"If you want to make an apple pie from scratch, you
must first create 
the universe."

- Carl Sagan

 

 



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