Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: Is Elke KB25 the same in 8x10 ?

  1. #1

    Join Date
    Nov 2008
    Location
    The Desert * Phoenix AZ
    Posts
    133

    Is Elke KB25 the same in 8x10 ?

    Hi everyone,
    So I have some PL25 8x10 (which I've yet to shoot) and am in love with KB25 in 35mm.

    So my question is ... are they the same stuff only slit & formatted different? I would love to use the 35mm or even 120 to test developers and stuff for the 8x10.

    Hmmm...

    Thanks~
    Steve

  2. #2
    Drew Wiley
    Join Date
    Sep 2008
    Location
    SF Bay area, CA
    Posts
    14,418

    Re: Is Elke KB25 the same in 8x10 ?

    Allegedly the same.

  3. #3
    Big Negs Rock!
    Join Date
    Mar 2000
    Location
    Pasadena
    Posts
    1,176

    Re: Is Elke KB25 the same in 8x10 ?

    Usually when the film is made, if I remember the Kodak process, it's 2 meters wide and as long as the base/liquid emulsion is. Once the emulsion is stable and can be handled, it is slit (cut). The emulsion is cut to whatever format is needed at the time. From what I see, Kodak runs a given amount of film based on orders and history. In the MP industry, one can get a significant discount when the film is ordered over a month in advance. It's prime cost when ordered in the week before. But a film will order between 60000 and 1million feet for a feature -- not a couple of boxes of 11x14 unfortunately. :-(
    Mark Woods

    Large Format B&W
    Cinematography Mentor at the American Film Institute
    Past President of the Pasadena Society of Artists
    Director of Photography
    Pasadena, CA
    www.markwoods.com

  4. #4
    Lachlan 717
    Join Date
    Apr 2007
    Posts
    2,364

    Re: Is Elke KB25 the same in 8x10 ?

    Wouldn't sheet film be significantly thicker than 35mm?
    Lachlan.

    You miss 100% of the shots you never take. -- Wayne Gretzky

  5. #5
    Big Negs Rock!
    Join Date
    Mar 2000
    Location
    Pasadena
    Posts
    1,176

    Re: Is Elke KB25 the same in 8x10 ?

    To my knowledge, it's all the same. If you think about it, if the quantification of Dmin for a given emulsion is constant for different formats, then the base is constant. You may be right. If one did the calculation of $$/Sq. meter, one could quickly see if the LF shooters are paying more for their film than the MP productions. Motion Pictures are shot in color, so it might be difficult to find a MP B&W film cost base to evaluate.
    Mark Woods

    Large Format B&W
    Cinematography Mentor at the American Film Institute
    Past President of the Pasadena Society of Artists
    Director of Photography
    Pasadena, CA
    www.markwoods.com

  6. #6
    Moderator
    Join Date
    Jan 2001
    Posts
    7,573

    Re: Is Elke KB25 the same in 8x10 ?

    The Fotokemika website says the Efke 35mm, 120 and sheet films are coated on three different bases - 130 micron acetate for 35, 100 micron polyester for 120, and 175 micron polyester for sheet film. So they'd have to come from different coating runs. There might be minor variations in sensitometric behavior too.

  7. #7
    Lachlan 717
    Join Date
    Apr 2007
    Posts
    2,364

    Re: Is Elke KB25 the same in 8x10 ?

    Quote Originally Posted by Mark Woods View Post
    To my knowledge, it's all the same. If you think about it, if the quantification of Dmin for a given emulsion is constant for different formats, then the base is constant. You may be right. If one did the calculation of $$/Sq. meter, one could quickly see if the LF shooters are paying more for their film than the MP productions. Motion Pictures are shot in color, so it might be difficult to find a MP B&W film cost base to evaluate.
    Thanks, Mark.

    The reason I asked is because I know some colour films are different in sheet v roll. For example, Provia is as follows*:

    Base Thickness .....
    Rolls-
    135 : 127μm
    120 : 104μm
    220 : 104μm

    Sheets: 205μm

    *From Fuji's Provia Technical PDF
    Lachlan.

    You miss 100% of the shots you never take. -- Wayne Gretzky

  8. #8
    Moderator
    Join Date
    Jan 2001
    Posts
    7,573

    Re: Is Elke KB25 the same in 8x10 ?

    I don't know of any emulsion that's coated on the same base for both sheet and roll variants. Kodak, Ilford and Fuji generally use acetate in different thicknesses for 35 and 120, and polyester for sheet films.

  9. #9
    LF/ULF Carbon Printer Jim Fitzgerald's Avatar
    Join Date
    Aug 2007
    Location
    Vancouver Washington
    Posts
    3,738

    Re: Is Elke KB25 the same in 8x10 ?

    Use the same developers. I've shot a lot of Efke 25 in 8x10 and love it. Take one holder and shoot two sheets and see what you get.

    Jim

  10. #10

    Join Date
    Aug 2010
    Posts
    83

    Re: Is Elke KB25 the same in 8x10 ?

    Yeah the sheets are thicker, but I use the same times and temps as 35/120 (4x5 only for me, though).

Similar Threads

  1. g-clarons for 8x10
    By Joseph O'Neil in forum Lenses & Lens Accessories
    Replies: 28
    Last Post: 1-Jun-2009, 18:49
  2. beginner 8x10 advice
    By sgelb in forum Cameras & Camera Accessories
    Replies: 29
    Last Post: 7-Nov-2008, 00:27
  3. Wide Angle Lenses for 8x10? - Lots of Questions!
    By Mark_S in forum Lenses & Lens Accessories
    Replies: 39
    Last Post: 24-Oct-2008, 21:29
  4. What else is needed for 8x10?
    By Joseph O'Neil in forum Cameras & Camera Accessories
    Replies: 19
    Last Post: 15-Sep-2008, 06:23
  5. 8x10 Enlarger...HELP please talk me out of it!!
    By ic-racer in forum Darkroom: Equipment
    Replies: 92
    Last Post: 18-Feb-2008, 07:09

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •