• Phase Contrast Microscope Alignment tutorial applet
• Abbe condenser repurposed for phase contrast
• History, theory, apparatus, procedure (11pp)
• Nikon CF Phase Contrast Equipment "Ph" Instructions (20pp)
• Understanding the Light Microscope (YouTube) - part 4 is Phase-contrast Microscopy
• curt0909:  "Zeiss Ph2 objectives and Olympus 40 PL and 20 Plan apo PL
    work seamlessly with the Nikon PH3 annulus."
• Do we need Phase Contrast?
• misaligned and mismatched phase contrast examples
• Phase contrast systems ranked (Nikon CF Plan over e.g. Chinese, Zeiss Standard, AO 10).
• apochronaut laments Phase Contrast varieties dwindling to mainly dark medium.
• Labophot 20x Phase Contrast focus stacking examples
• Positive Phase Contrast Objective Phase Plates
• Darkfield stop in phase contrast condenser wants matching to objective N.A.
• Optiphot comparison of desmid by BF, oblique, COL, DIC, pol
• Frez:  Circular Oblique Lighting obtained with an undersized 40x annulus
    aligned on the inner half of a 40x B&L DM phase plate
• Resolving Low Contrast Microstructure
    Using Transmitted and Reflected Circular Oblique Illumination (COL)
• Oblique vs COL +Pol +offset retarder vs phase

Nikon Labophot Phase Set With 5 objectives.

Nikon Labophot Phase Set. Works great with 5 objectives for Phase

• O - aperture
• DF
• Ph1
• Ph2
• Ph3
• Ph4

• Ph1 DL E Plan 10/0.25 160/-
• Ph2 DL 20/0.4 160/1.2     <- seemingly weird, but common..(inverted?)
• Ph3 DL E Plan 40/0.65 160/0.17
• Ph4 DL E Plan 100/1.25 oil 160/0.17
• Zeiss Ph2 Plan 40/0.65 160/0.17

Achro 40x/0.65	E Plan Ph3 40x/0.65	Phase Contrast

• Considering field aperture vignetting in uncropped images,
  trinocular eyepiece is evidently not coaxial with binoculars.
• Aligning phase annuli by (my) eye with centering telescope is problematic;
  a video camera to HDTV is wanted.
• Green illumination reportedly yields better phase contrast images than does white.