Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,721   Posts: 1,514,965   Online: 1150
      
Results 1 to 8 of 8
  1. #1
    Sanjay Sen's Avatar
    Join Date
    Mar 2005
    Location
    New York, NY
    Shooter
    Multi Format
    Posts
    1,251
    Images
    4

    Film Speed Test - Enlarging & Contact Printing

    Hi All,

    If I am doing a film speed test for a particular film that I use in 4x5 (enlarging) and 8x10 (contact printing), will the same speed test (say on 4x5 film) suffice for both purposes as long as I am using the same paper, developer and light source combination? Or will I need to do separate tests for negatives destined to be enlarged, versus those destined to be contact printed?

    If you believe separate tests will be necessary, I would appreciate it if you'd explain your reasoning as well.

    Thanks in advance for your help with this.


    Regards,

    Sanjay


  2. #2
    Stephen Benskin's Avatar
    Join Date
    Jan 2005
    Location
    Los Angeles
    Shooter
    4x5 Format
    Posts
    1,218
    I all depends. Technically, the requirements for contacting and enlarging will probably be different. Of course, the best way to tell is to test each printing situation to determine the negative requirements. The correct processing would be to adjust for each condition. On the other hand, if you are using a diffusion light source, the differences will be small and it isn't really necessary to do individual film testing unless you simply like the extra control.

  3. #3
    Sanjay Sen's Avatar
    Join Date
    Mar 2005
    Location
    New York, NY
    Shooter
    Multi Format
    Posts
    1,251
    Images
    4
    Currently, I use a Ilford Multigrade 500H enlarger head for both enlarging 4x5 (and smaller) negatives, as well as contact printing 8x10 negatives, if that helps with answering the question. Since I have a very limited time for photography, I would like to do the basic tests, but wouldn't want to do very extensive testing.


  4. #4
    Anscojohn's Avatar
    Join Date
    Dec 2006
    Shooter
    Medium Format
    Posts
    2,727
    Images
    13
    As above, theoretically they should be different when one uses a condensor light source for enlarging. I once had a T-shirt made which read BEWARE OF THE CALLIER EFFECT!! It has to do with the scattering of light in the denser part of a negative when the light going through it is collimated, so the fact is that the high tones might need different density in a negative to be enlarged rather than a negative which is contact printed.
    I am willing to be money (a small amount, to be sure (vbg) that if your Ilford head is a diffusion light source, you shall not find a noticeable difference if the negative densities on your 8x10 neg measure the same as your 4x5 neg. My two cents.
    John, Mount Vernon, Virginia USA

  5. #5
    ic-racer's Avatar
    Join Date
    Feb 2007
    Location
    Midwest USA
    Shooter
    Multi Format
    Posts
    6,097
    Are you using the same lens and shutter and meter? If so, then you should not need to repeat the exposure index test with the two different formats of the same film.

  6. #6
    Sanjay Sen's Avatar
    Join Date
    Mar 2005
    Location
    New York, NY
    Shooter
    Multi Format
    Posts
    1,251
    Images
    4
    Quote Originally Posted by ic-racer View Post
    Are you using the same lens and shutter and meter? If so, then you should not need to repeat the exposure index test with the two different formats of the same film.
    Different lenses, hence different shutters, but same meter.


  7. #7
    jp498's Avatar
    Join Date
    Oct 2009
    Location
    Owls Head ME
    Shooter
    Multi Format
    Posts
    1,430
    Images
    73
    Since you are using the same enlarger, I'd consider things the same. I'd say shoot things as if you are going to enlarge them. The only difference I see is that the negative is above the enlarger lens in one case and below the lens in the other case. Unless your enlarger lens is real bad (lacking contrast, dirty, moldy, and separated), you will not have much of practical difference.

  8. #8

    Join Date
    Jan 2009
    Location
    Los Angeles
    Shooter
    Multi Format
    Posts
    1,886
    Images
    54
    Have the shutter speeds checked and or corrected,would help alot to get to a ball park personal exposure speed for the film you test.I recently tested all my shutters and was surprised at the difference between them.For me it was a good starting place.

    Mike



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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