Mark I guess you ignored my note too? Oh, well. Regards Ralph W. Lambrecht http://www.darkroomagic.com On 2006-06-23 04:39, "Mark Blackwell" <markb1958@xxxxxxxxxxx> wrote: > > ----- Original Message ----- > From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx> > To: <pure-silver@xxxxxxxxxxxxx> > Sent: Thursday, June 22, 2006 5:17 PM > Subject: [pure-silver] Re: Suggestions needed from the real experts here > > >> >> ----- Original Message ----- >> From: "Mark Blackwell" <markb1958@xxxxxxxxxxx> >> To: <pure-silver@xxxxxxxxxxxxx> >> Sent: Thursday, June 22, 2006 8:34 AM >> Subject: [pure-silver] Re: Suggestions needed from the real experts here >> >> >>> Yes I sure it is, but that for this batch isn't really an option. I >>> called Kodak this morning. For those interested for Tri X its 10% and >>> for T Max its 5%. Took about 2 mins off and we will see on the contrast. >>> I knew that there was a general rule of thumb, but couldn't remember what >>> it was. >>> >>> When I print them we will see but the negs at least look workable. >>> >> Is this developing time? If so, its way off. The change in time for a >> given change in contrast varies with the film and is less for T-Max than >> conventional grain films but, on average, its around 25% to 33% reduction >> for a one paper grade difference in contrast. This is equivalent to about >> 3/4 stop speed to maintain equal densities. To push or pull film the >> difference is a little greater. Again, it varies with the film but for >> conventional films, and most, but not all, developers its about 1.4X the >> time for pushing or about 0.7x for pulling. A 5 or 10 per cent change in >> time will have very little effect on either contrast or equivalent speed. >> OTOH, Tri-X has probably more than ten stops of overexposure latitude so >> 2 stops with normal contrast development will still give you perfectly >> good tone rendition in the print. It will just take longer to expose the >> prints. >> >> --- >> Richard Knoppow >> Los Angeles, CA, USA >> dickburk@xxxxxxxxxxxxx > Thanks for the help Richard. Next time I might just develop normally and > test that out too. In fact sometime soon I might do it on purpose to see > what happens I am sure it won't be the last time the dummy behind the > viewfinder makes a mistake. LOL A drop in contrast might actually help this > particular subject, but a higher contrast paper is an option if needed. I > ended up using recommended development time x .80 for the Tri X and x .90 > for a role of T Max that was also done the same way per kodak > recommendation. Even if it was bad advise, its worth knowing that too. > > One thing I will say that I was a bit surprised at these days. First the > Kodak site had a phone number to call with a question. Second someone > answered the phone promptly, politely and answered my question. No long > waits. Only one or two menu items to get to a person. I like a lot of > different bw films, but I am going to buy a lot more Kodak because of the > fact that they took my call and answered a question. > > ============================================================================== > =============================== > To unsubscribe from this list, go to www.freelists.org and logon to your > account (the same e-mail address and password you set-up when you subscribed,) > and unsubscribe from there. ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.