MicroscopyU educational article published by Nikon Instruments Inc.. The Contributing Authors byline names both authors; no article publication date is established.
Cited passages: Stage Micrometers; Eyepiece Reticle Calibration, Figure 4 and procedure; Conclusions, line-edge errors and digital calibration at identical pixel resolution.
Publisher: Nikon Instruments, MicroscopyU.
Cited passages: Michael W. Davidson, Numerical Aperture, Formula 1 and object-side convention.
Publisher: Nikon Instruments, MicroscopyU.
Cited passages: Michael W. Davidson, Resolution, Formula 2 and discussion after Formulas 1–3: criterion and illumination dependence.