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Thread: Enlarger sizing

  1. #11

    Join Date
    Dec 2012
    Location
    Up North, UK
    Posts
    203

    Re: Enlarger sizing

    Quote Originally Posted by John Layton View Post
    Peter...you 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
    Location
    Sarnia, Ontario, Canada
    Posts
    797

    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?
    Peter,

    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)
    where,
    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,

    Len

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