Digital BW, The Print

If I understand what your saying, then for quick shooting, would it be
advantageous to auto bracket shots when shooting digital then?
DSLR's are rather automated beasts. I don't do this currently, but
maybe I should. Thoughts?

Scott

Truman Prevatt 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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