Digital BW, The Print

Don,

I've been wondering about a good means to do "effective ISO" testing for 
digital, so if you're willing to share I'd appreciate it if you'd send me 
some info on how you've done this.

Thanks!

--Greg

At 08:01 AM 9/10/2003 -0700, D. Hill wrote:
>Darrell,
>
>CMOS and CCD chips are more similar to slide film than
>of black and white film, being as they have much less
>latitude.  From basic camera controls in initial
>capture, there is not a method to stretch the latitude
>of the CCD.
>
>You can mimic the effects of n-1, n-2. etc., from
>various controls in photoshop - but that defeats the
>purpose of placing specific values or zones on site.
>
>As the digital camera is just an imaging device, you
>can apply zone system techniques for far less work in
>photoshop.
>
>My capture process:
>
>1. Read scene with handheld lightmeter, placing my
>important value.  I have determined the optimal ISO of
>my 10d is 80 with my materials.
>2. Capture in RAW mode.
>3. Transfer images to photoshop as 16 bit tiff.
>4. Convert image to greyscale.
>
>At this point the specific zone placed will fall
>exactly where I want it - without levels or curves
>manipulation.  The process is quite simple, and saves
>hours in photoshop.  I save this as my master file,
>making any corrections then printing.
>
>Write me directly if you would like to know my process
>for determining the proper ISO for digital, as well as
>constructing a zone ruler to see the latitude of your
>imaging chip.
>
>Don