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Polarizing microscopes for earth sciences

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Microscope ISO Standards

Compound (Biological), Universal, Metallurgical and Polarizing Microscopes
Objectives - Corrected for 160mm tube length
Objective Thread - 4/5inx1/32in and M25x0.75mm
Eyepiece Tubes - 23.2mm ID, 25mm OD
Phototubes - 23.2mm ID, 25mm OD
Eyepieces - 23.2mm OD
Eyepiece FOV - standard, widefield (wf), super wide (sw) or ultrawide (uw)
Graticules and Reticules - 16, 19 or 21mm
Slides - 45mm x 26mm, 76mmx26mm, 76x50mm

Note: The new Infinity Optic Microscopes have a different set of standards

Stereo Microscopes
Objectives - Usually Builtin
Eyepiece Tubes - 30mm ID
Phototubes - 23.2mm ID, 25mm OD
Eyepieces - 30mm OD

Adapters for Cameras etc.
SLR Camera T- Adapter = 25mm ID or 23.2mm OD (Microscope End), 42mm (Camera End), uses photoeyepiece
T-rings = M42mm x0.75mm(T-mount), Bayonet or Screw Mount for Camera (Camera End)
Photoeyepiece (for SLR Cameras) = 23.2mm OD, flatfield, 1-6x for eyepiece tube or camera tube