Re: Larger negatives

Luis Nadeau (nadeaul@nbnet.nb.ca)
Wed, 17 May 1995 01:10:27 +0300

The latter is very important indeed. Also, if you work with negs of any
size, a vacuum frame is necessary, especially if the subject matter has
lots of details, e.g., architectural. For carbon transfer printing, a
bleeding valve on the vacuum is also required or else, you are likely to
get "stress marks" in the highlights areas. This is explained in _Modern
Carbon Printing_

Luis Nadeau
NADEAUL@NBNET.NB.CA
Fredericton, New Brunswick, Canada

>
>You might, if you are interested in pursuing the subject further,
>read about penumbra and umbra, the partly shaded region around the
>shadow of an opaque body and the "full" shadow itself. Any good
>intro physics or astronomy text should explain the topic in detail.
>Anyway, IMHO shadows are well worth knowing about if you want to make
>photographs - hardly an obscure topic.
>
>
>--greg schmitz
>
>
> >===for PGP Key finger Greg Schmitz <gws1@cunix.cc.columbia.edu>===
> :: ::
> Key fingerprint = 73 D3 91 15 96 69 74 E5 14 51 71 44 C8 ED 01 11
> Key ID: A7026B1D Key Size: 1024 bits Created: 1994/11/10
> ==================================================================<