Lens mounting question (Fuji f/9 240 A)

Discussion in 'Large Format' started by mike_pry, Oct 20, 2001.

  1. I just had a question as far as mounting goes that maybe you could answer. I have a Burke and James and the lensboards are roughly 6x6 and composed of wood. The lensboards are 3/8" thick. The lens does not have the type of retaining ring that has a flange with screw holes that screw into the lensboard so that the retaining ring is mounted as its own entity to the lensboard(like the old Ilex shutters). Rather it is more like a threaded ring that simply screws on to the back of the shutter. So here is what I am thinking of doing..........First off the wood is to thick for the amount of threads given on the shutter so I propose to use a small router to plunge out the backside of the lensboard to lessen the thickness of the wood so I have enough"bite" on the threads when I screw the retaining ring on the shutter. I would make the routed area in a circular shape slightly larger as well and then drill a hole all the way through for the threaded collar of the shutter to go into and screw the retaining ring on from the back to complete the installation. Can you follow me on this? Does this sound like an acceptable solution ? Any help or advice would be well received. Actually the wood I am making the lensboard out of is not exactly 3/8" it is 9mm I believe and it is baltic birch plywood used for model airplanes and the like and has 8 plys so warping is not even an issue. Thank you in advance to any considerations given this matter!

    <p>

    Mike Pry
     
  2. Yes that will work and baltic birch is excellent for this. Just
    don't route it too thin. I have used baltic birch in 1/8" and glued
    extra strips on in the mounting areas for the needed thickness.
     
  3. If the shutter is a current 0 or 1 size you could simply buy a
    Rodenstock lens flange and screw it to the board with 3 small
    screws. We normally always have these in stock.
    You can order them M-F at 800 735 4373
     
  4. If the shutter is a current 0 or 1 size you could simply buy a
    Rodenstock lens flange and screw it to the board with 3 small
    screws. We normally always have these in stock.
    You can order them M-F at 800 735 4373

    <p>

    We also have 3 size
     
  5. I would be careful about routing the wood too thin, expecially of the
    lens is very heavy. It would not take much force to break out around
    the edges. I'm not sure about the lens you are using, it may be a
    very light compact lens. My suggestion would be either buy the lens
    flange, or make one. Get a piece of hardened aluminum sheet stock,
    the type used for Toyo, Sinar, etc. lens boards. Cut a square of this
    larger than you need, drill a hold in the middle to mount your lens.
    Then fasten this to the 3/8 inch plywood with some small screws and
    seal the edge from the back side with black silicone caulk.
     
  6. Mike:

    <p>

    Here is a simple method that avoids the precision routing step.
    Purchase a sheet of 1/8 inch plywood available from Woodcraft.com in
    walnut, cherry, birch etc. Using an exacto knife, cut a 6x6 piece to
    fit your camera using the old board as a template. Drill a hole in the
    center to match your lense/shutter diameter. Cut several thin (1/4-1/2
    inch) strips of the 1/8 ply and glue them to the front (or rear) edge
    of the lensboard. The idea is to build the overall edge thickness of
    the board up to 3/8.

    <p>

    Drop me a line if this is unclear.

    <p>

    ...........................................
     
  7. Model airplane plywood is great -- laminate a few sheets cut with an
    olfa knife. First sheet bigger than the next two. There seem to be
    two grades of this ply in the 1/8th inch. One is translucent and it
    is cheeper, so get the expencive one. I wouldn't want to use a router
    on a 6" by 6" piece of stock when I can laminate to the same end. If
    you do route then watch your fingers.
    Dean
     

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