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  1. #1

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    Acros and Pyrocat HD

    I recently picked up a box of Acros 4x5, and am interested in trying it with Pyrocat. Any general consensus on this combination? Experiences anyone?

    Of course, I have to do my own testing, but could you recommend a starting point development time? I process in a Jobo CPP2.

    Also, on a related topic: I have acquired (for free!) an X-Rite 810 densitometer. Are there issues reading pyro-developed negatives with this piece of equipment?

  2. #2

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    Quote Originally Posted by Jeffrey Moore
    I recently picked up a box of Acros 4x5, and am interested in trying it with Pyrocat. Any general consensus on this combination? Experiences anyone?

    Of course, I have to do my own testing, but could you recommend a starting point development time? I process in a Jobo CPP2.

    Also, on a related topic: I have acquired (for free!) an X-Rite 810 densitometer. Are there issues reading pyro-developed negatives with this piece of equipment?
    You are going to like ACROS in PC. for a normal CI do a 7 min development at 70 ºF. Of courseif you are going to use it for alt printing I would say up the development a couple of minutes. For scanning I guess the 7 min mark should get you started.

    The 810 is a good densitometer, but unfrotunatelly it does not read UV. Use the blue channel readings for PC.

    Good luck.

  3. #3
    Ed Sukach's Avatar
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    Quote Originally Posted by Jorge
    You are going to like ACROS in PC....
    I'm not replying to that message, Jorge. I cannot get your tagline :[ "Art is not what you see, but what you make others see." - Edgar Degas. ] - to be included in this quote.

    I'm semi-stealing it - if you do not object. It may be of interest over in Aesthetics.
    Carpe erratum!!

    Ed Sukach, FFP.

  4. #4

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    I stole it from Lenswork, so feel free....

  5. #5
    Melisa Taylor's Avatar
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    Quote Originally Posted by Jorge
    You are going to like ACROS in PC. for a normal CI do a 7 min development at 70 ºF. Of courseif you are going to use it for alt printing I would say up the development a couple of minutes. For scanning I guess the 7 min mark should get you started.

    The 810 is a good densitometer, but unfrotunatelly it does not read UV. Use the blue channel readings for PC.

    Good luck.
    Is this development time the same in any size Acros film? I shoot the 120 and 35mm size alot and would love to develop it the Pyrocat developer I just got.

  6. #6

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    Quote Originally Posted by Melisa Taylor
    Is this development time the same in any size Acros film? I shoot the 120 and 35mm size alot and would love to develop it the Pyrocat developer I just got.
    I am sorry Melisa but I dont know, I only used one box of 8x10, it is a nice film but too expensive for me.
    It seems ACROS is made the same in all different sizes, unlike TMX films. All I can tell you is try it, just to be sure expose ACROS at 64 and develop. I think you will get usable negatives this way.

  7. #7

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    One of my students has been using acros for night photography in medium format. It is rated at ei: 64 processed in pyrocat HD 1:1:100 at 20 degrees for around 12 minutes. Constant agitation for the first minute then 5 gentle inversions per minute thereafter. No presoak is used.

    This should get you close to a good CI for enlarging with a diffusion enlarger.

    The results are very sharp at 20" x 20" and with nice tones + excellent reciprocity characteristics to boot. It does not stain as much as fortepan 200 or similar films but seems to stain enough to give some grain masking & enhanced highlight separation.

  8. #8
    Melisa Taylor's Avatar
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    Quote Originally Posted by matt.s.
    One of my students has been using acros for night photography in medium format. It is rated at ei: 64 processed in pyrocat HD 1:1:100 at 20 degrees for around 12 minutes. Constant agitation for the first minute then 5 gentle inversions per minute thereafter. No presoak is used.

    This should get you close to a good CI for enlarging with a diffusion enlarger.

    The results are very sharp at 20" x 20" and with nice tones + excellent reciprocity characteristics to boot. It does not stain as much as fortepan 200 or similar films but seems to stain enough to give some grain masking & enhanced highlight separation.
    THANKS For the info!

    Ok. more questions... Why rate at 64? and would this info be the same if i'm using a condenser enlarger? (i think that's what they have at the college darkroom I print in--it's been a little while).

  9. #9
    Leon's Avatar
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    Quote Originally Posted by Melisa Taylor
    THANKS For the info!

    Ok. more questions... Why rate at 64? and would this info be the same if i'm using a condenser enlarger? (i think that's what they have at the college darkroom I print in--it's been a little while).
    hey melisa - good to see you here. My general rule of thumb is to give approx 10% less dev for condensor enlargers.

  10. #10

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    I and many others find that most black and white films are overrated in speed and lack rich shadow separation & smooth tonality when rated at the box speed. Acros is quite overrated in speed as far as i am concerned.

    When processing film to a higher contrast index for printing on azo etc there is generally a bit of a gain in foot speed (real speed), but with condensor enlargers, which need negs of a lower contrast than diffusion, I would be looking to rate the film at around somthing like ei:50 and maybe trying around 10 minutes processing time (12 for diffusion) with the procedure outlined in my previous post to get yourself in the ballpark.

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