Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 68,659   Posts: 1,481,491   Online: 1116
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1

    Join Date
    Dec 2009
    Location
    Merritt Island, FL
    Shooter
    Medium Format
    Posts
    17

    Most reciprocity failure?

    I have a need for some film in 120 and possibly in 35mm with appalling reciprocity failure in the 1-5 s range. Well, 4x5 could work, too. I often hear about how good certain films are for lack of reciprocity failure, but much less talk about which are worst. In my case, it's a desirable characteristic. Thoughts, anyone?

    --Rob

  2. #2
    Nicholas Lindan's Avatar
    Join Date
    Sep 2006
    Location
    Cleveland, Ohio USA
    Shooter
    Multi Format
    Posts
    2,372
    Images
    4
    Arista EDU 100 / Fomapan 100 is really wretched... 2x failure at 1 second, 8x failure at 10 seconds, 16x at 100 seconds

    http://www.foma.cz/upload/foma/prilohy/f_pan_100_en.pdf

    Reciprocity failure isn't really a time failure but a failure of sensitivity at low film illumination levels. Time is used because it corresponds to illumination at the film plane for a Zone V tone.

    However, few of us take pictures of 18% gray cards.

    For the above Fomapan, with a reference illumination level such that Zone V / 18% gray meters for a 1/2 second exposure, Zone IV will be 1 stop underexposed and Zone II will be 3 stops underexposed. If Zone V meters for a 1 second exposure, and you double the exposure to two seconds to compensate, then Zone VI-IX will be one stop overexposed and Zone II will be two stops under exposed. And so on and so forth.
    Last edited by Nicholas Lindan; 12-03-2011 at 12:27 PM. Click to view previous post history.
    DARKROOM AUTOMATION
    f-Stop Timers - Enlarging Meters
    http://www.darkroomautomation.com/da-main.htm

  3. #3
    Vaughn's Avatar
    Join Date
    Dec 2006
    Location
    Humboldt Co.
    Shooter
    8x10 Format
    Posts
    4,550
    Images
    40
    Efke...
    At least with LF landscape, a bad day of photography can still be a good day of exercise.

  4. #4

    Join Date
    Dec 2009
    Location
    Merritt Island, FL
    Shooter
    Medium Format
    Posts
    17
    Thanks, fellas. I have some Fomapan 100 in 4x5 right now. I'll have to give it a try on this project.

  5. #5

    Join Date
    Jun 2003
    Location
    Portland, Oregon
    Posts
    1,287
    It's not in current production, but a friend of mine joked that Bergger 200 started exhibiting reciprocity failure at 1/125 of a second. I think Bergger was a Fortepan variant.

    Peter Gomena

  6. #6
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    15,936
    Images
    148
    I did some practical reciprocity tests with Fomapan 200 and it was nowhere remotely near as bad as the published figures.

    The problem is there are far too many variables but in low daylight light levels 1 second at f8 it needed around half a stop extra and at 10 seconds at f8 only a stop extra not the 3 recommended by Foma. I've also used Fomapan 100 LF film in very low light levels and again little reciprocity failure.

    Most manufacturers only give ball park reciprocity figures because the reality is you need to test for all conditions, bracketing and notes can be enough.

    Ian

  7. #7
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    15,936
    Images
    148
    Quote Originally Posted by pgomena View Post
    It's not in current production, but a friend of mine joked that Bergger 200 started exhibiting reciprocity failure at 1/125 of a second. I think Bergger was a Fortepan variant.

    Peter Gomena
    Berrger 200 was Fortepan 200 which is itself a variant/descendent of Kodak Super-XX which the Forte factory manufactured along with Tri-X just before WWII when it was Kodak Ltd's Hungarian coating plant. The European Kodak plants came under the auspices of Kodak Ltd in the UK rather than Eastman Kodak in Rochester, US.

    Contrary to a digital company who've just launched a Tri-X plugin for Photoshop (to emulate the feel of the film digitally) on what they said was Tri-X's 50th Anniversary it was actually introduced in 1938/9 over 20 years earlier along with Plus-X, and Super-XX.

    I've still got 2 boxes of Fortepan 200 in 10x8 from the very last coating run and I can't say I've noticed any reciprocity but then I'd guess I've not used it a shutter speeds faster than an 1/8th second

    Ian

  8. #8
    Mainecoonmaniac's Avatar
    Join Date
    Dec 2009
    Shooter
    Multi Format
    Posts
    2,719
    Images
    6
    So far Fuji Neopan Acros has the best reciprocity response from my experience. Check out Flickr for images.

  9. #9

    Join Date
    Mar 2008
    Location
    San Diego, CA, USA
    Shooter
    Multi Format
    Posts
    2,069
    Images
    21
    Quote Originally Posted by Nicholas Lindan View Post
    Reciprocity failure isn't really a time failure but a failure of sensitivity at low film illumination levels. Time is used because it corresponds to illumination at the film plane for a Zone V tone.
    Thank you for the explanation---I've always wondered about that, why time rather than "number of photons" was the metric.

    I agree about Fomapan 100---it shoots like they forgot to put the reciprocity in when they mixed the emulsion! I find it useful for really long nighttime exposures, where the reciprocity failure helps control the highlights.

    -NT
    Nathan Tenny
    San Diego, CA, USA

    The lady of the house has to be a pretty swell sort of person to put up with the annoyance of a photographer.
    -The Little Technical Library, _Developing, Printing, And Enlarging_

  10. #10
    Ian Grant's Avatar
    Join Date
    Aug 2004
    Location
    West Midlands, UK, and Turkey
    Shooter
    Multi Format
    Posts
    15,936
    Images
    148
    Reciprocity affects the shadows more than the highlights. So it isn't going to help control the highlights.

    Ian

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin