Thanks Tom, I'll have to try a roll and see what happens. Now I'm waiting for someone to respond to the question on Diafine developer. Hadn't heard of it till today, verrrrryyy in-ter-es-ting!
Don > -----Original Message----- > From: Graywolf [mailto:[EMAIL PROTECTED] > Sent: Tuesday, October 26, 2004 2:08 PM > To: [EMAIL PROTECTED] > Subject: Re: C-41 Process Black and White > > > Traditional B&W film has a 'S' shaped characteristic curve where > the shadows are > compressed together at the bottom and the highlights are > compressed together at > the top with an almost straight line portion in the middle. That > straight line > portion is where you normally fit your exposure. It is, at normal > development, > about 10 stops long. (If you can get a hold of a copy of the data > sheet for > almost any professional film they will show the characteristic > curves of the > film on it for different developing times. You can probably down > load data > sheets from Kodaks website.) > > Chromogenic B&W has a much longer straight line portion something > in the order > of 15 stops (do to separate layers of differing speed instead of > differing > colors). That is why you can use different ASA's with the same > development. You > are just taking the 7 stops of your print from higher or lower along that > straight line portion of the curve. > > Chromogenic films do print much better on regular B&W paper but > the negatives > tend to be fairly low contrast and require that you use a high > contrast filter > and develop the paper for about the maximum time the paper will > allow (2-3 > minutes with most paper). > > I used to use XP1 extensively. Supposedly the only difference was XP2 is > optimized for C-41 development while XP1 was optimized for its > own developer but > could be developed in C-41. From what I have seen XP1 developed > in XP1 developer > was sightly better than XP2 in C-41, but XP2 in C-41 is better > than XP1 was. > > -- > > Don Sanderson wrote: > > Hi Collin, > > > > Don't understand "toe or shoulder", is this steep > highlight/shadow curve? > > > > Don > > > > > >>-----Original Message----- > >>From: Collin Brendemuehl [mailto:[EMAIL PROTECTED] > >>Sent: Tuesday, October 26, 2004 9:41 AM > >>To: [EMAIL PROTECTED] > >>Subject: Re: C-41 Process Black and White > >> > >> > >>It's a mixed bag. > >> > >>Some labs handle it well and give you nice results. > >>Tones are really soft but even. So it works well for > >>many portrait situations and the results are very > >>predictable. A good thing. And using the ubiquitous C-41 > >>process is a very convenient feature. > >> > >>Not much of a toe or shoulder, IIRC. (Someone correct me if I'm > >>wrong on that.) > >> > >> > >> > >>Sincerely, > >> > >>C. Brendemuehl > >>-------------------------------- > >>'Politics is supposed to be the second oldest profession. I have > >>come to realize that it bears a very close resemblance to the > >>first.' Ronald Reagan > >> > >> > >> > >> > >> > >>________________________________________________________________ > >>Sent via the WebMail system at mail.safe-t.net > >> > >> > >> > >> > >> > > > > > > > > -- > graywolf > http://graywolfphoto.com/graywolf.html > >
