You do not increase the contrast of colour negative film when you extend the processing time. In many cases you decrease it, because base density increases faster than highlight density, making your shadows all mucky.
Usually you also mess up the colour. Take it from the lab guys, it's true. -Aaron -----Original Message----- From: graywolf <[EMAIL PROTECTED]> Subj: Re: Fuji Press 800 vs Fuji NPZ - was Which High Speed Film etc. Date: Tue Mar 28, 2006 7:16 pm Size: 1K To: [email protected] No film gives an actual increase in film speed when pushed. All you can do is underexpose and increase the contrast in processing. That give an apparent increase in shadow detail at the expense of the highlights, not any actual increase in film speed. Of course if your film has say 3 stops of latitude you can simply move the exposure down the curve by underexposing a stop or so which is the usual process with C-41 and mini-lab machines. Many people incorrectly call this pushing. graywolf http://www.graywolfphoto.com http://webpages.charter.net/graywolf "Idiot Proof" <==> "Expert Proof" ----------------------------------- William Robb wrote: > > ----- Original Message ----- From: "Shel Belinkoff" > Subject: Re: Fuji Press 800 vs Fuji NPZ - was Which High Speed Film etc. > > >> I seem to recall Bill Rob stating, more than once and often emphatically, >> that you can't push, or that there's no benefit to pushing, color neg >> film. >> Perhaps someone can comment on this. > > > Yup. I said that. > C-41 is a develop to completion process. > There is nothing to gain by extending the development times. > Even the films that say they are pushable ( the old Press 800 for > example) would only give a bit more shadow seperation when development > was extended, but not an increase in speed. > > William Robb > > >
