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Thread: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and Fast

  1. #1

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    Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and Fast

    This afternoon I put together a 5X7 back out of junk parts that were laying around. It's for an old Kodak 2D that found it's way to my house. It had a nice 4X5 back but no 5X7. So I put one together from Stuff that was in the junk piles.

    After dinner I thought, I'd better check this assembled gobble-d-gook back and make sure things are lined up. Takes about 5 minutes, and it cracks me up that you guys will spend a gazillion dollars for some silver bullet outfit and never spend 5 minutes checking the most important thing. The film MUST be on the exact plane that the ground surface on your glass is at.

    I used a rubber band, a torpedo level, and a thick business card. A credit card might be even better.



    Lay the level across the back surface. Tap the biz card down until it sits flat on the glass. Carefully take it off and set it aside without bumping the card.



    Insert a film holder with a piece of film in place, and set the level back on the same surface you started with. That card should just brush that film if everything's perfect. Both of the ones I checked were spot on. Remember, it doesn't have to be pretty to make pretty pictures.

  2. #2

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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    easy peezy!

    nice

  3. #3
    Tin Can's Avatar
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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Yes, very good advice and 'how to'

    A level is useful when using a LF box, any straight edge will work for this
    sin eater

  4. #4
    Corran's Avatar
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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Good tip!

    What about cameras with the ground glass reversed, or with a fresnel?
    Bryan | Blog | YouTube | Instagram
    All comments and thoughtful critique welcome

  5. #5
    Tin Can's Avatar
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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Ha, stole my upcoming post!

    Basically add the GG thickness if reversed, fresnel is different, not my topic yet

    I recently got 3 'cycle' camera types that definity used GG ground side to the rear

    I will document the 4 I have soon

    Quote Originally Posted by Corran View Post
    Good tip!

    What about cameras with the ground glass reversed, or with a fresnel?
    sin eater

  6. #6

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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Quote Originally Posted by Corran View Post
    Good tip!

    What about cameras with the ground glass reversed, or with a fresnel?
    Don't know, and since I don't I removed a glass and fresnel from the 4X5 and went with traditional straight glass. Someone will chime in. I've been spooked by them ever since the huge long discussion about first generation Chamonix that didn't quite get it right?

  7. #7
    Corran's Avatar
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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Yep and I have one of those Chams!
    Bryan | Blog | YouTube | Instagram
    All comments and thoughtful critique welcome

  8. #8
    Jim Jones's Avatar
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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    Quote Originally Posted by Tin Can View Post
    . . . Basically add the GG thickness if reversed, . . .
    . .. . and allow for the refractive index of the ground glass.

  9. #9
    Tin Can's Avatar
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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    I'm no genius at that, but is seems negligible for 1.5mm soda green as I measured one from 1902 at 3 days ago

    https://refractiveindex.info/?shelf=...oda-lime-clear

    Please elucidate


    Quote Originally Posted by Jim Jones View Post
    . .. . and allow for the refractive index of the ground glass.
    sin eater

  10. #10

    Join Date
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    California
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    Re: Check Your Ground Glass ~ Film Holders for Registration! Simple, Important and F

    GREAT IDEA!! Thanks
    On another note, why would anyone insert the ground glass backwards?

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