Hi Bill ... I agree with you 100%, but I'd like to throw something into this discussion that's not been mentioned before. We've talked about it privately, and now seems to be a good time to bring it to the list.
There are some developers, notably Acufine, that allow one to rate an emulsion at a higher - sometimes a substantially higher - speed with no loss of shadow detail, which is what sometimes gets lost in a "classic push". I don't consider using these developers to increase the speed of the film as pushing. Rather, through some means unknown to me, they actually deliver negatives with a full range of shadow detail along with the higher speed rating. So, rather than "pushing" a film one might consider using a developer that actually increases a film's speed and range of usefulness. However, I don't really understand how this is done - what the chemical agents are, etc. Any comments on this, Bill? William Robb wrote: > A films speed rating is based on its threshold exposure > sensitivity. That is the minimum amount of light needed to give > a change of +.15 (1/3 stop) on the visual setting of a > densitometer. This speed point is remarkably unaffected by > changes in development, because it is based on sensitivity of > the emulsion to light, not developer. If the emulsion hasn't had > enough exposure to embed a latent image, no amount of > development will create one, and that, my friend, is it, period. -- Shel Belinkoff mailto:[EMAIL PROTECTED] - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
