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julian_bell1

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Posts posted by julian_bell1

  1. Several years ago I have done manual colour separations from colour photographs for the printing industry.

    We used red, green and blue filters in a reproduction camera using orthochromatic graphic film.

    I have tried to do this also at home but could never find the filters. They are not to be found in photographic shops but maybe in a graphic artists suppliers.

    Some of the vertical reproduction cameras I have worked with had the filters built in. Now these cameras are more or less obsolete, maybe you can find one with filters to salvage. The cameras are often sold cheap these days and people buy them just for the lenses, which are interesting too.

    You then just need an orthochromatic film.

    IHTH.

  2. A couple of years ago I built my own 4 x 5 point & shoot camera. You

    can see it here: http://job.webstar.nl/newcampg.html

    I didn't work to any plans so it is no use asking me for them.

    It works well but I haven't used it much lately. I use film rated at

    800 ISO and a gray day soon brings the shutter speed down to below

    1/30th sec. with the lens wide open at f8. Handheld I prefer to use

    it at 1/125th sec.

  3. Other problems with photographing close ups in large format are

    calculating the exposure factor caused by the necesary bellows

    extension and a solid tripod because of long exposure times.

    On my Tachihara I use my 150mm apo-symmar for up to about 1:1 and

    for more magnification I use a reversed enlarger lens.

    I have an old 60mm componon mounted backwards on an old shutter that

    I use for close ups on a 6 x 9 century graphic and the 4 x 5

    tachihara. See http://www.webstar.nl/~job/rosepage.html

    Also check out the older messages section for techniques on close up

    and macro photography.

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