Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 76,284   Posts: 1,681,144   Online: 684
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 12
  1. #1

    Join Date
    Mar 2006
    Shooter
    Large Format
    Posts
    146

    more emulsion pics.

    Here are a few prints from the home made emulsion.
    I usualy have some small blotches or spots on the negative,probably dust flying around in the dark room whith the dehumidifyer going.

    Some blemishes are round blury spots one of wich can be seen to the right of the smoke stack on the steam engine picture.
    Attached Thumbnails Attached Thumbnails 2007-12-17-1026-42.jpg   2007-12-17-1026-03.jpg   2007-12-17-1026-24.jpg  

  2. #2
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    24,669
    Images
    65
    Yeah, coating defects. I've seen those.

    Very nice, congratulations. What was the ISO, can you tell us?

    PE

  3. #3

    Join Date
    Jun 2004
    Location
    Portland, OR
    Shooter
    4x5 Format
    Posts
    3,268
    Kevin - good work. I love the little guy next to the steam engine!

  4. #4

    Join Date
    Mar 2006
    Shooter
    Large Format
    Posts
    146
    ISO is about 3.
    I tried to find a suitable picture in a book or other photos to use for the guy by the engine with no luck, so I used one of my studio test exposures from a couple of years ago. Just print to size,cut out,glue on a stick and place in hole next to subject.

    What can cause the defects and what would be the cure other than an imperfectly clean plate?

  5. #5
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    24,669
    Images
    65
    Did you filter the emulsion?

    Using a stainless steel (gold mesh) coffee filter will do wonders for defects.

    PE

  6. #6
    Michel Hardy-Vallée's Avatar
    Join Date
    Apr 2005
    Location
    Montréal (QC)
    Shooter
    Multi Format
    Posts
    4,354
    Images
    135
    Very nice, I think I actually like the defects in the emulsion!
    Using film since before it was hip.


    "One of the most singular characters of the hyposulphites, is the property their solutions possess of dissolving muriate of silver and retaining it in considerable quantity in permanent solution" — Sir John Frederick William Herschel, "On the Hyposulphurous Acid and its Compounds." The Edinburgh Philosophical Journal, Vol. 1 (8 Jan. 1819): 8-29. p. 11

    My APUG Portfolio

  7. #7

    Join Date
    Jun 2004
    Location
    Portland, OR
    Shooter
    4x5 Format
    Posts
    3,268
    Quote Originally Posted by Sirius Glass View Post
    Cure them or cause them?

    Steve
    He means "cures" them.

    Something similar to this is what PE is suggesting:
    http://www.bedbathandbeyond.com/prod...1&SKU=12198515

    Filter the melted emulsion right before coating the paper or plates. It removes any bits of crud, solidified gelatin, or silver halide particulate that will make little blotches on the finished product.

  8. #8
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    24,669
    Images
    65
    Just make sure it doesn't contain any brass, bronze or copper. Then it won't cure them, it may cause them. Iron may also cause spots.

    PE

  9. #9

    Join Date
    Mar 2006
    Shooter
    Large Format
    Posts
    146
    I used muslin cloth for filter material, maybe that is letting out small fibres and may not be compleatly clean since I reuse the cloth each time,I clean it out with hot water after use.

  10. #10
    Photo Engineer's Avatar
    Join Date
    Apr 2005
    Location
    Rochester, NY
    Shooter
    Multi Format
    Posts
    24,669
    Images
    65
    Well, I've used muslin and it seemed ok. I've also washed it with no apparent problem. But, I've found that the muslin pore is larger than many foreign objects, so the coffee filter appears to have performed better for me.

    PE
    Last edited by Photo Engineer; 12-18-2007 at 12:05 PM. Click to view previous post history. Reason: grammar and phrasing

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