Re: minimum print time test


"Steven Woody" <narkewoody@xxxxxxxxx> wrote in message
news:1155176680.542621.265690@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
i found a problem when do the minimum print time (MPT)
test. i did the
test use a clean negative to cover half opening of the
negative
carrier. then using diefferent exposure time ( 2s, 4s, 6s
... ) to
make a serial of strip on the paper.

after developed and dry the paper, i then try to find in
what print
time i can not tell the difference in black between two
strips in the
film side of the paper ( the paper is divided into 2
sides, because the
film covered only half of the carrier ). actually, i found
the 16s
looks with same black with 18s strip ( that meas i can not
tell which
is which ). by this, i think my MPT should be 16s.

but the problem is, the 16s strip is still not as black as
the clean
side of the paper. there exists a little difference.
but, from 16s
on, the clean side of the paper goes really very black so
i actually
can not tell where is 18s where is 20s. i just saw that
in some strips
longer than 16s, the film side and the clean side come to
totally same
in black.

my question is, should i use 16s as my MPT?

thanks.

-
woody

Its difficult to reach the actual maximum black of any
paper with normal printing. The difficulty is that an
exposure great enough to reach maximum black may result in
an overly dark print, or, if contrast is increased, an
overly contrasty print.
As long as the blacks are fairly deep the eye will
accept them. The best prints are made by finding the
exposure and contrast that result in good looking mid gray
tones, something you can judge by eye.
Personally, I find excercizes such as finding a minimum
exposure both a waste of time and misleading.


--
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx


.

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