Page 2 of 2 FirstFirst 12
Results 11 to 12 of 12

Thread: Enlarger sizing

  1. #11

    Join Date
    Dec 2012
    Up North, UK

    Re: Enlarger sizing

    Quote Originally Posted by John Layton View Post mentioned birch plywood, square bellows, and rails on wheels... ...Hope this helps...and good luck!
    Thanks John. What a great setup! You have the luxury of space. I'll be constrained to running (and projecting) along a 2 ft deep piece of worktop (to a corner wall to the right) but should still be able to get a decent size print.

  2. #12

    Join Date
    Sep 2008
    Sarnia, Ontario, Canada

    Re: Enlarger sizing

    Quote Originally Posted by peter brooks View Post
    Thanks Len, yes that calculation would be really useful - if possible, could you post it here?

    It is simply the magnification equation...

    Enlarger Negative Stage, Lens & Baseboard Distances => u=v*F/(v-F)=F*(M+1)/M or v=u*F/(u+F)
    u = lens to negative distance (inches)
    v = lens to baseboard distance (inches)
    M = Magnification
    F = lens focal length (mm)
    u+v = negative to baseboard distance (inches)

    I have a spreadsheet where I put that into a single sheet, and ran some numbers for different focal length lenses to determine magnification, given that my enlarger head was hitting the bottom of a floor joist and constraining the maximum u+v value even with the drop table.

    Good luck with it,


Similar Threads

  1. Need help with filter sizing.
    By Xia_Ke in forum Lenses & Lens Accessories
    Replies: 27
    Last Post: 2-Apr-2019, 00:38
  2. lensboard sizing
    By quixoticcassandra in forum Lenses & Lens Accessories
    Replies: 15
    Last Post: 14-Jan-2015, 17:10
  3. Sizing Tripod: RRS TVC 33 vs 33S
    By dodphotography in forum Gear
    Replies: 2
    Last Post: 2-May-2014, 21:14
  4. Sizing paper
    By jfert92 in forum Darkroom: Film, Processing & Printing
    Replies: 1
    Last Post: 16-Feb-2012, 19:57
  5. Sizing photos for website
    By Big Fish in forum Business
    Replies: 41
    Last Post: 14-Jan-2011, 19:50


Posting Permissions

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