Auction Sniper
back

Infinity Optiphots

Closely related discussions

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.
    Only "F" trinocular head focus objective rays at 210mm;
    "T" and "UW" heads have a pseudo-infinity space around prisms:

    Nikon's CF PL chimney has an M50x0.75 external thread and positive lens.
    Removing that chimney passes the infinite image...
    Alternatively, removing that negative lens would focus infinity objectives,
    but with a bit under a 0.5x magnification.

    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

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

    ocular scale   (image by iPhone)

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

    Other Optiphot infinity configurations
    • maintained by blekenbleu