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Afocal photomicroscopy



Most microscopes lack photo ports;  in particular,
stereo microscopes typically lack photo ports,
and those photo ports don't do stereo.
Standard microscope eyepieces work with intermediate image,
focussed by objectives or tube lens 10mm down eye tubes.
Without shortened tube to focus on camera sensors, as for e.g. C-mount,
using camera lens focussed near infinity over eyepiece exit pupil can work well.

  • Afocal adapters.
  • 40mm pancake lens works well for afocal with APS-C sensor;
      step-down ring (green arrow) adapts filter thread to 48mm extension tube:
     

    40mm lens with 10x oculars for APS-C vs 35mm

    APS-C (90D)35mm (6D)

    B & L
    B & L

    AO 146
    AO 146

    WF10x/18
    WF10x/18

    WF10x/20
    WF10x/20

    CFWN10x/20
    CFWN10x/20

    WF10x/22
    WF10x/22

    Discussion


    This investigates afocal camera image FoV variation with ocular FoV,
      NOT image quality.
    Cycloptic rack changes affect scale much faster than focus;
    focus changes were only by M42 helicoid pancake-to-ocular lens spacing
    and EF 40x STM focus ring.
    Nikon CFWN 10x/20 diopter adjustment was evidently quite mismatched to others.

    50mm lens on 35mm A7R afocal with 10x/22 ocular

    I inherited an old MD ROKKOR-X 50mm 1:1.7;
    its front lens in recessed about 10mm behind 55mm filter thread.

    Adapted to a digital camera with 35mm sensor,
    with an ocular protruding most of the way into that recess:
     

    10x/22 ocular fills 35mm sensor with negligible corner vignetting:

    • maintained by blekenbleu