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Infinity Optiphots

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Optiphot 100 / 150

  • Optiphot 49.5mm to infinity head 51mm circular dovetail adapter

    Infinity-focused Optiphot trinocular heads

    Nikon Optiphot (CF) M Plan & EPI objectives have 210mm tube length.
    "F" trinocular head objective rays focus directly;
    "T" and "UW" heads convert rays to near infinity around prisms:

    Nikon's CF PL chimney has an M50x0.75 external thread and positive lens.

    scars from failed attempts to unscrew M40x0.75 thread

    Removing that chimney (or at least pos. lens) passes infinity rays...
    Alternatively, removing that negative lens would focus infinity objectives,
    but with a bit under a 0.5x magnification.
    Instead, parting the chimney immediately left of its M40 thread,
    then screwing an M42-M40 step-down ring on that:

    ...enables attaching an M42 to mirrorless camera flange adapter

    200mm zoom telephoto

    A camera with (250mm) telephoto lens focused at infinity,
    as discussed on photomacrography.net:

    Canon 90D+250mm

    ... captured these images:

    stainless millimeter rule


    calibration slide
    same target as below

    ... but strongly vignetted images are magnified about 3X relative to oculars:

    ocular scale   (image by iPhone)

    This scale issue is addressed by T / UW "direct" projection
      and arguably better using a Zeiss Triotar.

    Other Optiphot infinity configurations
  • Around 2001, Optiphot 100/150/200 were replaced
      by largely incompatible L150 using CFI60 objectives,
      - LV100D is a manual model of the Nikon LV100 series (2005).   instructions
        - configuration guide
    ...then in 2012 by LV-N 100 / 150, using CFI60-2 TU Plan EPI and BD objectives.
    There are also TU Plan ELWD EPI + BD, as well as T Plan EPI SLWD objectives.
    • maintained by blekenbleu