diff --git a/README.md b/README.md index 110c342..5a72257 100644 --- a/README.md +++ b/README.md @@ -77,6 +77,12 @@ than box ASA speeds. (See the [Updates](#updates) section for other ideas.) +* When faced with a low contrast or short Subject Brightness range, a + lower dilution semistand (1.5:1:250) for an hour seems to work best. + Begin with 2 minutes agitation and one 15 second midpoint agitation + at 31 minutes. At this dilution, you should pretty much get box ASA + speeds. + * But there is a big downside with this. Highly dilute development raises acutance at the expense of making grain more visible. This tends to get worse the longer the film sits in developer. @@ -86,13 +92,8 @@ with faster films like Tri-X. For this reason, when processing 35mm film, I use Pyrocat-HD 5:3:500, agitate initially for 90 seconds, for 5 seconds at 7, 14, and 21 minutes, and pull the film at 28 - minutes. - -* When faced with a low contrast or short Subject Brightness range, a - lower dilution semistand (1.5:1:250) for an hour seems to work best. - Begin with 2 minutes agitation and one 15 second midpoint agitation - at 31 minutes. At this dilution, you should pretty much get box ASA - speeds. + minutes. For really short SBRs, you can increase the time and + spread out the agitations accordingly. ## Introduction @@ -361,10 +362,11 @@ Kodak "framed" film hangars, a Yankee 4x5 tank, and a "frameless" Kodak film hanger. -* Film was presoaked for 5 minutes in running water to wash off the +* ~~Film was presoaked for 5 minutes in running water to wash off the anti-halation layer and prepare the emulsion to accept developer. It's not clear this is entirely necessary with open tanks but it - does no harm. + does no harm.~~ See [Updates](#updates) section for a note on why + I no longer do this. ## What I Have Discovered @@ -921,6 +923,19 @@ seemed to control the highlights well and promoted strong edge effects. +### Update 10-20-2024: Dispensing With Prewetting + +The subject of prewetting film before actual development has been an +on-again, off-again debate among serious practioners for quite some +time. After reading a bunch of stuff and listening to people make +their case, I am currently of the view that it is actually not a good +idea and not needed in any case. There is a strong argument made that +prewetting swells the emulsion and may actually make it harder for the +film to absorb the developer. Since I have stopped prewetting, I have +seen no difference in outcomes. So, at the very worst, it makes no +difference and you can save yourself the time. + + ## Copyright And Use All content here is Copyright (c) 2021-2024 TundraWare Inc., Des Plaines, IL USA