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From: Moose <olymoose@xxxxxxxxxxxxx>
C.H.Ling wrote:
 But for film comparison, there is no discussion, see why  almost all 
professional (except news, portrait and wedding) use
I've used a lot of slide film. I shot it almost exclusively for many years. 
Wonderful stuff. People who like it should use it. It has clear advantages 
for many uses over negative. I'm just arguing that it isn't inherently any 
more color accurate than negative film. I believe there are at least 3 
reasons, other than inherent color accuracy, that many professionals use 
slide film.
slide you will know, especially for product shoots.
 
1. Personal, institutional and industry habit and reproduction equipment 
requirements.
2. They and their clients like to look at the film images directly when 
evaluating them - for composition, sharpness, etc. in addition to color 
accuracy. Loupes, light tables and projectors don't work with negs and 
cheap, automated prints are very poor measures of what is actually on the 
film.
3. Storage, retrieval and handling are easier with slides. You can just 
pick up the sheet holder and see which is which at a glance. For someone 
using digital darkroom and storage, either either original form is equal.
 
There is a fourth reason why transparencies are preferred to color 
negatives: contrast.  In a properly executed print, the contrast ratio 
between the brightest and darkest areas of the image are supposedly at most 
100:1.  With transparencies, this contrast ratio soars to 400:1!  I have 
long heard transparency enthusiasts brag about the "bottomless" blacks 
achievable with their medium of choice but virtually impossible with prints. 
 The latitude with transparencies is much tighter, but the derived contrast 
is supposedly what makes it all worthwhile. 
John
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