UC wrote:
> On Oct 14, 6:43 pm, Jean-David Beyer <jeandav...@[EMAIL PROTECTED]
> wrote:
>> UC wrote:
>>
>>> You don't want a straight curve for outdoor work. You want an S-shaped
>>> curve, such as that of Tri-X or HP5 or Neopan 400.
>> OK, that is one reason for our different results: I do want a straight
line
>> curve for all my work.
>
> Why? What kind of work do you do? If you do outdoor work with lots of
> sky and clouds, you're better off with a film like Tri-X pan, which
> has softer highlights and contrastier shadows. It helps offset flare
> int he shadows and helps keep the sky from going too light.
Because for 4x5, the 4164 Tri-X has the poorest shadow detail I have ever
seen (although the all-toe 4147 PlusX is somewhat similar) unless I expose
it a couple of stops more than I should (as measured by testing the
exposure
to get net density of 0.1 for Zone I exposures) to get the lower zones of
the extremely long toe of the film. Shooting Tri-X at EI 80 to 100 just
does
not make sense. With the short toe of TMY, I get much more shadow contrast
unless I accidentally overexpose.
As far as highlight contrast is concerned, a slight reduction in
development
time usually handles it (although, more often I either burn them in or use
a
lower grade for the paper).
I do not get all that much flare in the shadows because when there is risk
of flare, I shade the lens with either a lens shade, or the darkslide from
the film holder. My Wisner Convertible Plasmat lens set has optically
coated
elements and has reasonably low flare (not measured). I get more flare
with
my uncoated Meyer Gorlitz, which I seldom use anymore. The Schneider
SuperAngulon 90mm f/8
>
>> If I do not want detail in the shadows (rare), I can
>> reduce exposure and it will essentially drop off altogether.
>>
>>>> Tri-X 4164 has such a long toe that it has very low
>>>> shadow contrast, requiring sufficient exposure to get things off the
toe.
>>>> The amateur Tri-X in 35mm format has a very different curve. Was that
what
>>>> you tested?
>>> Yes. 35mm Tri-X Pan.
>> That is the second reason for our different results. For 35mm work,
Tri-X
>> has an acceptable curve shape. But 4164 Tri-X is so different that it
should
>> not even have the same name as the 35mm stuff.
>
> Correct.
--
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