If you're shooting color neg film, C-41 process is fairly standard. However, I still find that most color films process better when rated a half to a full stop slower than the indicated ISO. In other words, shoot Portra 160 at about 100 to 120. Shoot Portra 400 at about ISO 300. You'll get better negs. Color slide film, on the other hand, should be shot at the indicated ISO and exposed very carefully. Only with BW will you benefit from zone exposure and processing. Paul -------------- Original message ---------------------- From: "J and K Messervy" <[EMAIL PROTECTED]> > And if you don't process film yourself? > > I will be taking film to the local pro lab for processing. > ----- Original Message ----- > From: "Shel Belinkoff" <[EMAIL PROTECTED]> > To: "Pentax-Discuss Mail List" <[email protected]> > Sent: Thursday, October 19, 2006 9:27 PM > Subject: Re: Remedial film photography. :) > > > > And, of course, with B&W film, there's a lot more control on the > > processing > > end, so one can "over expose" the film, or expose for the shadows, and > > develop for the highlights, so that there are no blown highlights. So, > > for > > a Q&D example, you can rate TX @ 200, cut back the standard processing > > time > > by 25% or so, and get a negative that will print quite well. > > > > Shel > > > > > > > >> [Original Message] > >> From: John Francis > > > > > >> Paul Stenquist wrote: > >> > Your example is extreme, but most films seem to be slightly overrated > >> > in regard to ISO. > >> > >> Hardly. The ISO testing procedure is well-defined, and rigorously > >> followed. If a film says ISO 400 on the box, you can be darn sure > >> that it will score 400 on the ISO measurement scale. > >> > >> But that doesn't mean blindly loading a DX-coded cassette into > >> your camera, pointing the camera at a random scene, and letting > >> that determine the exposure will produce the results you want > >> (even assuming the average brightness of your subject is anywhere > >> close to 12% grey). Furthermore, shifting the exposure up the > >> scale (which is what you do if you rate the film at slower than > >> the box speed) will decrease noise in the shadows at the cost of > >> possibly blowing out the highlights, while shifting downwards > >> towards under-exposure will generally increase colour saturation. > >> It's all a matter of choosing what effect you want, and then > >> deciding which film to use, and how to rate it, in order to > >> get close to that result. > > > > > > > > -- > > PDML Pentax-Discuss Mail List > > [email protected] > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > > > > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net
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