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Thread: Experience with HP5+ shot/developed at ISO 100 in D76

  1. #1

    Join Date
    Jan 2021

    Experience with HP5+ shot/developed at ISO 100 in D76

    Last night, I had what I thought was Ektapan in my tank, as it came out of a holder I had labeled "Ektapan". I got some in an expired lot off ebay and fell in love, so I've been buying it when I see it.

    Anyways, it was very warm in my house, and even dumping ice in my bath only got the chemistry down to ~78deg F. That got me about 5:06 for development time with stock D-76 in my Combi-Plan, and with the added time from how long the thing takes to fill and empty (35oz of chemistry takes a while!) I figured I'd safely be above the magical 5min time Kodak recommends as a minimum for even development. After pulling the film out of the tank to hang it to dry, I notice the edge code isn't the "V U" of Ektapan. Oops, that was HP5! I haven't scanned my negatives yet, but they look alright.

    Has anyone else pulled HP5 to 100ISO in D-76 before? What did you think? I feel kind of bad because I prefer to push HP5 to 1600, but at least I didn't waste something I can't replace.

  2. #2

    Join Date
    Apr 2015
    Purcellville, VA

    Re: Experience with HP5+ shot/developed at ISO 100 in D76

    I have done something similar. You will have to judge for yourself whether the rendering of the range of densities suits you. It's a far cry from pushing -- 4 stops more exposure, putting your low values up the curve considerably. The high values you'll be able to deal with without much difficulty; you'll just have a very different sort of negative. Discovery!
    Philip Ulanowsky

    Sine scientia ars nihil est. (Without science/knowledge, art is nothing.)

  3. #3

    Join Date
    Sep 2010

    Re: Experience with HP5+ shot/developed at ISO 100 in D76

    HP5+ can be very nice at EI 100. I've posted my findings here a number of times and no one seems to disagree, or no one has done their own tests.

    Years ago I learned an excellent method to find the correct developing time and EI for any film. The source was an article by William Mortensen. Mortensen wrote some excellent books and articles about basic sensitometry. The last time I did this test was when I abandoned Tri-X and switched to HP5+ due to cost about five years ago. I proceed as follows.

    I set up my trays with my favorite developer HC110B (1:31), now Ilfotec HC (1:31). I pull out a sheet from the package in the dark. and then when the package is sealed again I turn on the room lights. This part of the test is done under the lights. I cut the sheet into five strips and mark them 1-5 by punching holes with a paper punch. Lets say the recommended time is 5:00. I want to see 3:00, 4:00, 5:00, 6:00 and 7:00, so I throw all the strips into the developer and agitate as usual until 3:00 when I move the No.1 strip over to the stop bath. Then I pull No.2 at 4:00, No.3 at 5:00, etc. I fix, wash and dry the strips as usual. What we are looking for is the best usable film DMax value. Obviously the film has been fully exposed! When strips dry lay down a page of news print on a table in good light. Find the strip through which the news print is barely visible. That's your developing time. Now to find the film speed.

    Go outside in unchanging light conditions and expose five sheets and expose one at the manufacturers rating and then the other four at one half a stop and one stop less and one half a stop and one stop more. In the dark, develop them all together for your newly derived time. Contact print them together exposing and developing the paper for maximum usable paper DMax value through the film base plus fog negative rebate area. Pick out the best-looking contact print and you have your film speed.

    Because my 7:00 negative looked the best on the first test, I did the test again with 7:00 as the central developing time and found that 8:00 was indeed too dense. This HP5+ time was the same as the as the developing time I had been using for Tri-X and film speed was also the same, EI400. I have also switched to Ilfotec HC developer due to cost and availability and find it to be a clone of HC110.

    Many of the last generation of B&W gurus favored a development time of 5:00 for Tri-X and suggested an EI of 64-100. You can do the above test backwards, developing for 5:00 minutes and finding the film speed. I like 100. The difference between negatives exposed at 100 and developed for 5:00 and those exposed at 400 and developed for 7:00 is quite subtle. Both could be considered "normal" or N negatives. The 100 negative has slightly greater shadow and highlight detail that only a careful, knowledgeable viewer could detect. This slight improvement might not be worthwhile trading for two stops in the field. I do routinely rate HP5+ at 100 under powerful strobe light in the studio and it produces beautiful skin tones.

    From here, if you are still with me, you can derive expansion and contraction schemes for both the 100 and 400 "normal negs". I do this by changing dilution rather than time. Make sure you have at least 1 oz. of the concentrated sauce for each 8X10 sheet or equivalent. For contractions I found that 3/4 oz. concentrate to 31 1/4 ozs. H20 yields an N-1 neg at a one stop loss in film speed and 1/2 oz. concentrate to 31 1/2 ozs. H20 yields an N-2 neg at a two stop loss in film speed. For expansions, 1 1/4 oz. of concentrate to 30 3/4 ozs. H20 yields an N+1 neg at a one stop gain in speed and 1 1/2 ozs. concentrate to 30 1/2 ozs. H20 produces an N+2 negative with a two stop gain in speed.

    If you look at the chart of Tri-X film speed in Phil Davis' BTZS book you can easily pick out the film speed in HC110B 5:00 as EI 64.

    Don't apply reciprocity exposure and development corrections for long exposures (1/2 sec. +) based on published data. Test for yourself and you may be surprised. I wasted a lot of time and effort producing long exposure negatives that were thick and flat. When I finally tested, I found no compensation was required for TXP or now HP5+ out to one minute.
    Last edited by Neal Chaves; 2-Aug-2021 at 10:44.

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