Archived posting to the Leica Users Group, 2005/03/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks Bill, I tested some triX last year in dilution H. I found ASA 160 to be optimal for this dilution if you want good shadow detail, but ASA 320 was only a stop difference. I never finished the testing but I am about to start using Trix and HP5 soon, this weekend. Currently I'm only using FP4 ASA 100 in HC110, 1:42 dilution which is close to Dilution D, (I just started mixing 12ml per 500ml for convenience). I generally run at 70F for 9.5 minutes light agitation, 5 seconds per minute. I can get a good density range for grade 2 and 3 paper with this combination. I made a lot of tests based on Dan Ridings suggested that development time and dilution might be linear. Looking over my FP4 testing today after your reply I see 2 good data points to test Dan's suggestion. A 1:33 dilution at 4.75 minutes and a 1:42 dilution for 7.5 minutes gave me the same density range for FP4 (1.21 between zone I and VIII.) Projecting a straight line down to 1:67 (dilution H) gives roughly a time of 12.25 minutes. So if dilution and development time is linear I should get the same density from FP4 dilution H (7.5 ml concentrate) at 12.25 minutes. The linear graph is interesting, (yes I just made a graph), because it approximates a slope of -1 which suggests that that Time + ml of concentrate must approximate the intercept for that density range. This suggests that with one good data point one could project the dilution and development time for any contrast range assuming the slope doesn't vary too much at the extremes. For Example: For FP4 I run 9.5 minutes using 12ml concentrate for a density range of 1.26 between Zone I and VIII. With an assumed slope of negative 1 the intercept is 21.5. So any combination as long as it is close to 21.5 should give me similar contrast range. So if I want to use a dilution of 7.5 ml concentrate the time would be 14 minutes. For Dilution B at 15ml the time would be 6.5 minutes for the same density range. If you eyeball the increase in contrast range between 12.25 minutes(range=1.14 between zones I-VIII) minutes and 14 minutes (range of 1.26 between Zone I and VIII) it is about one stop or one zone shift to the left. Just about right. This is great is it holds experimentally. Bill you may be my muse I'm glade you asked! Chris (212) 639-7391 -----Original Message----- From: lug-bounces+saganicc=mskcc.org@leica-users.org [mailto:lug-bounces+saganicc=mskcc.org@leica-users.org] On Behalf Of bill harting Sent: Thursday, March 24, 2005 3:59 PM To: Leica Users Group Subject: Re: [Leica] bill dilution H. Hi Chris, My approximate normal time for TriX at 800 is diultion H at 11 minutes, 75 degrees. I had an odd accident, though, in this processing. I did two rolls in one can, and a single roll of 120 from something else in another, and I accidentally unthinkingly mixed the HC110H at half strength, so Pedro, John and Bob were developed in HC110 at a dilution of one-quarter ounce syrup to 1000cc. I wondered why they were so thin. But yet apparently not too thin (I have not printed them yet). Mark was developed separately later in a two reel can, and I had my oh-shit moment when was pouring the syrup and realized what I had done on the first two rolls. So I went ahead with the 11 minute time; these negs look normal and fine. So what does this tell me? I won't know until I print, but HC110 even wicked diluted seems to keep working. I won't try that again, though. Your experiences? bill h ----- Original Message ----- From: "Saganich, Christopher/Medical Physics" <saganicc@mskcc.org> To: "Leica Users Group" <lug@leica-users.org> Sent: Thursday, March 24, 2005 3:44 PM Subject: RE: [Leica] bill H. > Bill, > What time, temp are you using for the dilution H? > > Christopher Saganich > > (212) 639-7391 > > -----Original Message----- > From: lug-bounces+saganicc=mskcc.org@leica-users.org > [mailto:lug-bounces+saganicc=mskcc.org@leica-users.org] On Behalf Of Peter > Dzwig > Sent: Thursday, March 24, 2005 2:15 PM > To: Leica Users Group > Subject: Re: [Leica] Sound missing > > bill harting wrote: > >> Tuesdays a pickup jazz group plays at my local coffee shop -- a lot for >> talent for the price of a cup of coffee. Here are this week's players. >> M3 90/2.8 TriX HC110h most shot at f2.8 to f4 >> >> http://gallery.leica-users.org/album20?page=2 >> >> all opinions welcome >> >> bill h >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> >> > Like all of them Bob. The expression on Pedro's face is great. The photo > of > Mark, although blurred conveys a lot about him, his playing and his mood. > > Thanks for sharing. > > Peter Dzwig > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > > > > ===================================================================== > > Please note that this e-mail and any files transmitted with it may be > privileged, confidential, and protected from disclosure under > applicable law. 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