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  1. #51
    shutterfinger's Avatar
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    1. Bert's got 20 years on me.
    2. A standard film holder backing plate is .197 ± .007 from the film holder edge for formats 2x3 through 4x5.
    http://home.earthlink.net/~eahoo/page8/filmhold.html
    3. A Graflex film holder backing plate is .224 from the film holder edge in 4x5, tolerance unknown.
    4. The view hood ground glass can be shimmed up to 1/8 inch (.125) higher without causing problems, lowering more than .010 inch may require milling the mount opening down.
    5. TriX TXP sheet film is .007 inch thick.

  2. #52

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    Quote Originally Posted by shutterfinger View Post
    1. Bert's got 20 years on me.
    2. A standard film holder backing plate is .197 ± .007 from the film holder edge for formats 2x3 through 4x5.
    http://home.earthlink.net/~eahoo/page8/filmhold.html
    3. A Graflex film holder backing plate is .224 from the film holder edge in 4x5, tolerance unknown.
    4. The view hood ground glass can be shimmed up to 1/8 inch (.125) higher without causing problems, lowering more than .010 inch may require milling the mount opening down.
    5. TriX TXP sheet film is .007 inch thick.
    What is the delta difference between the base of the Gralex mount and the Graflok mount to the same point within the camera body? The math states you have 0.015 to 0.150 to play with, yes?

    tim in san jose
    Where ever you are, there you be.

  3. #53
    shutterfinger's Avatar
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    The standard film holder places the film closer to the lens making the image out of focus when used on a camera whose ground glass is set for the Graflex film plane. This is the reason the Graflex SLR view hood ground glass has to be repositioned when converting the camera from using Graflex film holders to using standard film holders even if the back is replaced and mounted in the same position as the original.

  4. #54

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    So you are saying the old back plate and the new back plate are the same thickness?
    Where ever you are, there you be.

  5. #55
    shutterfinger's Avatar
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    I've only done 2 mods, converted a 1910 RB Auto to use standard film holders then switched it back when I sold it; Made an adapter for a 3x4 RB Auto to hold a Graphic roll film holder. In both cases the original back frame was used.
    Last edited by shutterfinger; 03-05-2013 at 02:28 PM. Click to view previous post history.

  6. #56
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    I have two 6x9 roll film holders for my 3x4 Model D SLR. If push comes to shove on sheet film, I can always shoot 120. I have plenty of green sensitive x-ray film, I'm going to try cutting it and loading into a bag-mag. Converting it looks to be too much of a PITA.

    m
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  7. #57

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    Don't quite understand why you think it's a PITA, when it's been noted several times in this thread, and confirmed by me, that the conversion takes less than 30 minutes, and is 100% reversible.

    Now, cutting down *any* sized film down to 3x4 for each and very frame in a darkroom, or even under safe-lights... now THAT is a PITA But I guess to each his own. I'll enjoy shooting stock 4x5 sheet film and 4x5 as well as 3x4 Fuji/Polaroid instant film on my converted R.B.

  8. #58

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    Quote Originally Posted by shutterfinger View Post
    I've only done 2 mods, converted a 1910 RB Auto to use standard film holders then switched it back when I sold it; Made an adapter for a 3x4 RB Auto to hold a Graphic roll film holder. In both cases the original back frame was used.
    Ok, so a different modification is talked about then.
    Where ever you are, there you be.

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