[rollei_list] Re: looks like ... Agfa Scala
- From: Mark Rabiner <mark@xxxxxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Mon, 30 May 2005 07:38:18 -0700
On 5/30/05 5:26 AM, "Carlos Manuel Freaza" <cmfreaza@xxxxxxxxxxxx> typed:
> Ruben:
> I'm afraid that your post has a serious
> omission, you don't consider the process and the
> chemicals used for the process, the secret for the
> special Agfa Scala reversal process like for the
> Rollei R3 pushed film process are the chemicals.
> However, for the Scala film, its relationship with the
> APX 100 is a historic data and is a technical data,
> you can compare the spectral sensivity for the APX 100
> and the Scala reading the Agfa film technical data
> sheet, they are identical:
>=20
> http://www.agfaphoto.com/en-GB/photography/professional-photography/films=
/down
> loads/F-PF-E4en.pdf
>=20
> (It's necessary to scroll the page)
>=20
> You can imagine the chemical process influence for the
> grain if you consider that for "normal" films, there
> are developers giving ultra fine grain, fine grain,
> medium grain, etc., and in fact, the Scala film also
> can be developed using a "normal" developer producing
> excellent negs=A1
>=20
> All the best
> Carlos=20
>=20
>=20
>=20
I don't know why they would show those spectral sensitively on the top of
each report like it was a big deal. So your lips are more light with one
film than the other I've never heard of anyone picking a film because of
it's spectral sensitively.
Look at the characteristic curve! That shows you more what a film is going
to make images like. The scala is of course reversed and of course like a
transparency film way more steep and vertical meaning much more gamma and
contrasty, a shorter distance from left to right than a normally processed
black and white film.
We are comparing normally processed black and white film against
transplanted film folks! Even if it's black and white slides instead of
color it's still slides! Reversal processing! Scala film is going to
resemble Kodachrome a lot more than it's going to resemble a black and whit=
e
negative. And I'm talking reversing the direction of the curve so they'd
maybe match up.
A negitive we of course don't look at.
We don't look at normally processed black and white film.
We look at the prints we make from that film.
And that makes a whole different curve in the end.
In Ansel's photo series he says a black and white glossy print has a 50 to
one luminance ration. A matt print 20 to one. But a slide, projected I thin=
k
is 200 to one.
Slides you expose for the highlights and you loose the shadows real fast.
Negitives you can still expose for the highlights and your not going to
loose your shadows anywhere near as fast. Your tonal range is much wider
than slides.
Saying Scala resembles Agfapan 100 seems real way off crazy to me. Maybe I'=
m
missing something.
Mark Rabiner
Photography
Portland Oregon
http://rabinergroup.com/
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